[PICS] Emma Watson Shows Off Fit Tummy In Pink Sports Bra

The gorgeous 21-year-old British actress who is in the US filming her new movie The Perks Of Being A Wallflower was spotted exercising in Pittsburgh, Pennsylvania while wearing nothing but a pink sports bra and leggings.

The fit stomach she displayed wearing a pink sports bra tells that she has been on this path to gym for quite some time now. "Harry Potter" star is set to star opposite Logan Lerman in a film adaptation of this movie. Teen idol spent the long Memorial Day weekend near the western Pennsylvania city, working on the movie and hanging out with her costars.

The British actress was seen with her co-stars on set in Pennsylvania on Tuesday and we’re channeling their inner Rocky Horror Picture Show characters. The 21-year-old British actress plays Sam in the drama-romance, which also stars Logan Lerman and Vampire Diaires‘ Nina Dobrev.

Watson will play a girl named Sam, one of Charlie the protagonist's (and narrator) only two friends. There's also the last "Harry Potter" film, "Deathly Hallows: Part 2," which is scheduled to hit theaters July 15.

"I'm lucky that I'm this size naturally. I don't diet...I love chocolate and pasta and I love baking. I make a great raspberry amaretto cake!" she said in a recent interview.

The Perks Of Being A Wallflower will also star Vampire Diaries actress Nina Dobrev, newcomer Logan Lerman and Parenthood star Mae Whitman.