Can you guess the future star?

Some of Hollywood's hottest started off as adorable kids. Can you guess these famous faces before they were stars? ... In order to announce their first pregnancy, Fergie took to Twitter to share this adorable mash-up of herself and hubby Josh Duhamel as kids. “Josh & Me & BABY makes three!!! #mylovelybabybump” the 37-year-old Fergalicious singer Tweeted on Feb. 18, 2013 along with the photo.

We wonder if seven-year-old Kim Kardashian ever thought she'd grow up to be such a huge reality star?! A lot has changed in the last two decades, namely Kim finding makeup ... and flaunting her assets.

Awww ... Chris Brown was totally an adorable kid. Too bad he's grown up to be one of Hollywood's most volatile celebrities.

Even as a baby, Sofia Vergara was a flirt! The "Modern Family" star showed off a photo of herself in her younger years in Barranquilla, Colombia.

Child actor Jaden Smith was even cuter as a little baby! His celebrity mom Jada Pinkett Smith shared a Twitter photo of her baby boy in the tub on his birthday.

Blond beauty Emma Roberts used to be a little blond cutie! The Disney darling shared her intimate baby shot on Twitter for her fans.

Hilary Duff had the '90s baby look down pat! The youthful Disney actress now has a child to call her own. Duff gave birth to Luca in March 2012.

Fit to be queen! Before she was the Duchess of Cambridge, Kate Middleton was just your typical toddler destined for royalty. Here, she's seen pictured as a three-year-old on holiday in Britain's Lake District (l.).

Already practicing for her close up, a young Emma Stone poses for a portrait taken while she was a student with The Valley Youth Theatre in Phoenix, Arizona. Now 23, the actress has become a red carpet pro.

She's a natural! A young Kate Upton shows she knows how to strike a pose long before she ever graced the cover of Sports Illustrated in a teeny bikini.

A young Elvis Presley is barely recognizable without his signature black coif in this photo, dated from the early 1940s (l.).

Lea Michele must have been especially "Glee"-ful as a kid. The 25-year-old singer got her start as a child actress on Broadway, appearing in "Ragtime" and "Les Miserables."

She might be one of Hollywood's hottest, but Rihanna was once an awkward-looking pre-teen just like the rest of us. Here, the Grammy Award-winning singer is pictured at a carnival in Barbados at age 13 (l.).

It's hard to believe Brad Pitt was ever a reject. The actor smiles for a team photo with his childhood basketball squad, the Cherokee Rejects, in 1977.

A true star in the making, rapper Jay-Z (real name Shawn Carter) is photographed proudly sporting his cap and gown in an early graduation photo.