15 Stars You Forgot Were Child Actors

You know him as the sexy (often shirtless) star of Teen Wolf, but did you know that he played the kid of a sexy diva in a memorable '90s romantic comedy?

That's right: Posey costarred with Jennifer Lopez in Maid in Manhattan. Did you catch their reunion in 2014?

And Posey isn't the only Teen Wolf Tyler with a child-star past.

In 2002, Hoechlin played Tom Hanks's son in Road to Perdition.

Dennings is most recognized now for her role as filthy-mouthed waitress Max on the TV series 2 Broke Girls.

And back in 2000, Dennings was just as foul-mouthed (if not more) as precocious teen Jenny Brier, one of Sam's clients, on Sex and the City.

Hoffmann has been making waves as offbeat characters in the past few years, like her role on Amazon's hit Transparent and the part of Adam's sister on Girls. If her face looks familiar to you, let us tell you why.

Hoffmann was just 7 when she played Kevin Costner's daughter. She had a thriving career as a child star, also memorably appearing in Now and Then.

He's created controversy (I'm Not There) and earned praise in Her, but do you know how far back Phoenix's career goes?

Well, it goes all the way back to 1986, when he made his starring debut in SpaceCamp! (He was just 12.)

Maybe you knew that Wood was a child star (seen here in Into the Forest), but did you know she got her start before her breakout role in Thirteen?

Here she is as Lainey Christian Taransky in the 2002 Al Pacino film S1m0ne.

Parenthood's Mae Whitman became well known for her emotional portrayal of Lauren Graham's daughter Amber.

And here's where she perfected her cry-face: in movies like Hope Floats, as Sandra Bullock's sensitive daughter. (She was also adorable as George Clooney's daughter in One Fine Day.)

Paquin played Sookie Stackhouse for seven seasons on True Blood, but before she was a telepathic faerie, she got her start very, very young.

Paquin starred with Holly Hunter in The Piano — and snagged an Oscar at the tender age of 11. (Bonus: remember when she played Freddie Prinze Jr.'s little sister in She's All That?)

The glamorous Charlotte Grayson on ABC's Revenge had an adorable and memorable breakout role as a child star, but do you remember it?

Yep, Allen played the younger version of Jennifer Garner in 13 Going on 30!

You know her well as Twilight's leading lady, and since then she has had much more grownup roles, like in this year's Cafe Society, but do you remember her pre-, pre-Bella days?

There was this role, in Panic Room, in which she played Jodie Foster's daughter when she was just 12.

The dashing actor has become an in-demand leading man, but do you remember what he was doing before movies like Southpaw?

Yes, cute little Gyllenhaal was acting — remember him as Billy Crystal's son in City Slickers?

The young star who is so affecting in The Perks of Being a Wallflower got started earlier than the Percy Jackson franchise.

His cute little mug also played young Ashton Kutcher in 2004's The Butterfly Effect.

Jenny Lewis pays homage to her child-star past in her music video for "She's Not Me." She memorably re-created this dance . . .

From Troop Beverly Hills! That's her on the far left.

British heartthrob Hoult (seen here in Kill Your Friends) has broken out in the last few years in films like Mad Max: Fury Road and as Hank (aka Beast) in the X-Men movies, but he had a very memorable role as a kid.

He was Marcus in 2002's About a Boy — yes, the kid who lived to annoy Hugh Grant.

Though we will always know him as Pacey Witter, Jackson has established himself in another TV role as Cole on Showtime's The Affair.