Emma Watson on the set of her new movie "The Bling Ring" on April 12, 2012. Credit: AKM-GSI

For her role in the upcoming flick The Bling Ring, Emma Watson has gone through a dramatic transformation. First came the long, brown wig and on Thursday, she showed off some major faux ink!

Clad in Daisy Dukes, a bra top, a leather jacket and high heels, the Harry Potter starlet, who turns 22 Sunday, flashed a large temporary tattoo across her tailbone -- body art that is most commonly referred to as a "tramp stamp."

Directed by Sofia Coppola and costarring Leslie Mann, American Horror Story star Taissa Farmiga and featuring a cameo by Gavin Rossdale, The Bling Ring is inspired by the real-life group of tech-savvy Hollywood-area teens who burglarized the homes of Paris Hilton, Lindsay Lohan, Orlando Bloom, Rachel Bilson and Audrina Patridge between 2008 and 2009.

Watson isn't the only star to have rocked some out-of-character faux ink for a movie recently.

On April 2, Jessica Alba hit up a Beverly Hills park with her two girls, Honor, 3, and Haven, 7 months, while rocking large tattoos on her arm and tailbone.

"A local tattoo artist in Atlanta did it on her," a source told Us Weekly about the actress' faux body art for her role in A.C.O.D. "Jessica thinks it's pretty tough."