Celebrity Siblings?

Chad and Rob Lowe



One of the original "Brat Pack" members, 1980s film star Rob, of The Outsiders and St. Elmo's Fire fame, went on to appear on TV's The West Wing. His brother Chad, Hilary Swank's ex-husband, stars on Pretty Little Liars and won an Emmy for his role on TV's Life Goes On.

Nick and Drew Lachey



Two weeks after Nick and wife Vanessa Minnillo welcomed son Camden in September 2012, Nick headed to Dancing With the Stars to root on his brother Drew during the show's All Star season. "I don't know if he was here more to support me or more to just get a night out of the house!" Drew joked to Us of his older brother. "I've been that new father twice, so I know how it is!"

Lindsay and Ali Lohan



"We always have good sister-bonding time," Ali tells Women's Wear Daily of her big sister, who joins fellow siblings Dakota and Michael in the family headed by Dina Lohan and her ex-husband Michael. "Whenever we see each other, we're always talking about clothes and all girly things, you know? She just says the main thing is to do your best and to do what you love. We're very close and speak very often."

Warren Beatty and Shirley MacLaine



"When we were kids, I really did protect him," MacLaine told Oprah Winfrey of her younger brother, actor Beatty. "[And] he always wanted to tag along with me and my girlfriends, but I always said, 'No, no, go home.'"

Jake and Maggie Gyllenhaal



"The thing that's great about family is the honesty. When you do work [like we do], it's nice to have someone to say 'Yeah, I believed that, but I didn't buy that,' Jake told Anderson Cooper of his bond with actress sister Maggie. "We are our own toughest critics, but we also love each other's work more than anybody."

Paris, Prince and Blanket Jackson



"I have lots of memories of my father," Paris tells the Daily Mail of her late father, the King of Pop Michael Jackson, who died in 2009. "He was an incredible father. We all loved him to death."

Julianne and Derek Hough



After their parents divorced, dancer Julianne moved from Utah to London with Derek to study at London's Italia Conti Academy of the Arts. Years later, both Hough siblings hit it big on ABC's Dancing With the Stars. Julianne—who released a country album in 2008 and starred in Safe Haven in 2013—won twice, with partners Apolo Ohno and Helio Castroneves, and Derek took home the mirrorball trophy four times: With Brooke Burke, Nicole Scherzinger, Jennifer Grey and Kellie Pickler.

Britney and Jamie-Lynn Spears



"Criminal" singer Britney first danced on stage at age 3 and won loads of pageant trophies, which are now housed in a museum in Kentwood, La. "I found out what I'm supposed to do at an early age," Britney has said. Her younger sister—aunt to Britney's boys Sean and Jayden and mom to daughter Maddie—followed years later with her own country singing career, even debuting a song for Britney called "I Look Up to You" in 2012.

Teresa Giudice and Joe Gorga



As much as Gorga tries to repair his fractured relationship with sister—and Real Housewives of New Jersey costar—Giudice, the mom of four just isn't willing to meet him halfway. "You're not my brother anymore. It's a shame," she fumed during a May 2012 episode. Retorted her brother: "All I want you to do, once in a while, is realize you're wrong," he said. "How about being my sister? Being an aunt to my kids? How about just being normal?!"

Hilary and Haylie Duff



"I always wanted to be like my older sister Haylie. When she learned to ride a bike, I had to as well. If she took ballet lessons, I did too," Hilary—mom to son Luca with Mike Comrie—has said. "I took singing lessons because she did. It all just got more intense until it turned into careers for both of us."

Tia and Tamera Mowry



First garnering acclaim as lovable sitcom twins on Sister, Sister, the Mowrys continued to make their mark on the entertainment industry, with Tia having appeared on The Game and Tamera on Strong Medicine. In August 2011, the women premiered their own Style Network reality series, Tia & Tamera, which chronicles their lives as working, married moms.

Luke and Owen Wilson



As part of the acting Wilson family that also includes Andrew, Owen recently told Jay Leno he initially had trouble earning street cred in the industry. "You tell people you're making a movie and they go, 'Well, who's in it?' And you say, 'I'm in it and then, my brother's in it and my older brother's in it. And my friend's directing it.' And then their eyes glaze over and they go, 'This guy's totally full of it,'" he joked.

Zooey and Emily Deschanel



"Emily's four years older, which is a very vulnerable amount of years. Because when I was 3, she was 7, and she was already evil," New Girl's Zooey joked to Jimmy Kimmel in 2012 of her actress sister. "She basically just used the plot of Invasion of the Body Snatchers to terrify me . . . made crazy faces at me and talked like Vickie from Small Wonder. She would make me cry and then my dad would come in and try to mediate, and then she would laugh."

Kate and Rooney Mara



"As kids, we were both obsessed with movies and musicals," House of Cards' Kate—whose family founded the New York Giants and the Pittsburgh Steelers—told Chelsea Handler of her younger years with Oscar-nominated Girl With the Dragon Tattoo actress Rooney.

Ben and Casey Affleck



Directed by his older brother Ben in 2007's Gone Baby Gone, Casey told Reuters being on set with his brother in their Boston hometown made filming much more comfortable. "Doing movies can be a sort of bonding experience," Casey said, "but it pales in comparison to 32 years of brotherhood."

Paris and Nicky Hilton



"The press called us 'the modern-day Eloises.' I remember going up in the elevator of the Waldorf with Bill Clinton and other presidents," Nicky told New York Magazine of growing up with Paris in New York City as the granddaughters of Hilton hotel heir Conrad Hilton. "Walking down Madison and seeing all the schoolgirls and smelling that fresh-laundry smell that you only smell on the Upper East Side still gets me very nostalgic."

Chris and Liam Hemsworth



"I'm reminded, now that my little brother's working a lot, how much more interesting he is," Chris tells OUT magazine of The Hunger Games' Liam. "So I give him a punch when I see him." (The Australian natives also have a third actor brother, Luke.)

Kelly and Jack Osbourne



During their schooling, Kelly and Jack (who also have a sister, Aimee) stayed in their native London and went on the road with dad Ozzy during breaks. "The kids would go to California and stay at the Beverly Hills Hotel and see all the Paris Hiltons and all that s--t, and then they'd come home and . . . we had a very normal life," mom Sharon once told Biography. "It was a good learning experience for the kids."

Prince William and Prince Harry



Growing up as the privileged sons of Prince Charles and Princess Diana, William and Harry tried their best to live their lives as average little boys. The duo "enjoyed getting rough," former royal housekeeper Wendy Barry told Us. Another favorite pastime of the young princes? Tormenting the staff with water pistols.

Mary-Kate and Ashley Olsen



Rising to fame in 1987 sharing the role of Michelle Tanner on Full House, the twins—whose younger sister Elizabeth Olsen is also an actress—appeared in a string of successful straight-to-video films (including How the West Was Fun and Holiday in the Sun) once Full House wrapped in 1995. In the years since, the Olsens have designed clothing lines The Row, Elizabeth & James and Olsenboye.

Beyonce and Solange Knowles



Both moms, the singers are raising their children to be as close as they are. The families get together at least once a week, so their little ones—Daniel Julez and Blue Ivy—have spent lots of quality time with one another, Solange tells New York Magazine. "[Blue] and Julez are going to grow up more like sister and brother than cousins," Solange said of her son and her sister's daughter with Jay-Z.

Kim, Kourtney and Khloe Kardashian



First making a splash on the E! network in 2007 when Ryan Seacrest gave their family—including Kris, Bruce, Kendall and Kylie Jenner and Rob Kardashian—a reality show (Keeping Up With the Kardashians) and several spin-offs—the trio have turned themselves into bonafide moguls, with three boutiques, a Sears collection, books and a makeup line to their name.

Jessica and Ashlee Simpson



These musically-inclined sisters have children close in age—and although Ashlee welcomed son Bronx years before Jessica had daughter Maxwell and son Ace, she told Us Jessica needed little coaching. "I am so proud of her!" Ashlee said. "There were small things here and there [I advised her on] that you ask your friends and other mothers [about] but other than that, she's great."

Rumer and Scout Willis



Rumer—the oldest daughter of Bruce Willis and Demi Moore—applauded her sister's efforts in June 2014 after Scout went topless to protest Instagram's nudity policy. "She's very bold...I give her mad props for that," Sorority Row actress Rumer told Access Hollywood following Scout's stroll through NYC as part of a "#FreetheNipple" demonstration. "I don't know if I'd be brave enough to do it."

Willow and Jaden Smith



Not only do these celebrity kids share A-list parents Will and Jada Pinkett Smith, but they both have an affinity for certain slithery creatures: Snakes! "Willow is obsessed with snakes," says a source, adding that Jaden "cuddles" with them in bed and refers to his sister's pets as his "girlfriends."

Mark and Donnie Wahlberg



"The Wahlberg boys have this larger-than-life tough guy reputation, but in truth, we're all a bunch of momma's boys," Donnie has said of his family, which includes actor brother Mark, Wahlburgers chef Paul, and six other siblings led by matriarch Alma Wahlberg.

Kate and Pippa Middleton



"It is a bit startling to achieve global recognition before the age of 30 on account of your sister, your brother-in-law and your bottom," Pippa, a party planner who earned notoriety after serving as her sister's maid of honor in 2011, has said. "One day I might be able to make sense of this. In the meantime I think it's fair to say that it has its upside and its downside."

Kendall and Kylie Jenner



The daughters of Bruce and Kris Jenner, reality stars Kendall and Kylie have been inseparable since childhood. "She was obsessed with me," Kendall, two years older than her sister, told Marie Claire Mexico in March 2014. "She followed me everywhere." Agreed Kylie: "If she got up in the middle of the night, I got up of the middle of the night. I literally couldn't leave her side. We even matched everything we wore."

Benji and Joel Madden



Recording five studio albums as part of Good Charlotte, the twins recently branched out as The Madden Brothers to release the single "We Are Done," and upcoming album Greetings From California. Tweeted Joel in May 2014: "Twinning is winning!