Abigail Breslin's August: Osage County Costars Didn't Recognize Her All Grown Up

By Sheila Cosgrove Baylis

09/12/2013 at 02:35 PM EDT

Abigail Breslin in Little Miss Sunshine and following the August: Osage County premiere

FOX Searchlight; WireImage

We fell in love with her in Little Miss Sunshine as a young girl who lives for pageants, her grandpa and quirky outfits.

Now, Abigail Breslin is all grown up and almost unrecognizable – her light blond locks have even her August: Osage County costars doing double takes.

"The cast doesn't recognize me," Breslin tells E! of her more platinum hair. "I was like, 'Hey guys!' and they were like, 'Who's this random girl crashing our photo shoot today?' "

And what a cast it is! Breslin, 17, stars alongside Julia Roberts, Meryl Streep, Ewan McGregor, Juliette Lewis, Dermot Mulroney, Sam Shepard and Benedict Cumberbatch in the dramatic comedy about family dynamics.

Once August: Osage County comes to theaters in December, Breslin may start to get recognized more often.

"I was in a supermarket and this girl was like, 'Oh my gosh, that's Abigail Breslin,' and her friend was like, 'No, it's not. She looks nothing like that,' " Breslin says. "I was like, 'Okay.' "