艾玛o沃特森庆祝22岁生日，为电影《珠光宝气》玩纹身，

Emma Watson is sporting some new ink -- a lower back tattoo known as a "tramp stamp," which appears to be temporary and for her role as a teen burglar in the new Sofia Coppola film "The Bling Ring."

The actress, known best for her role as prim and proper witch Hermione Granger in the "Harry Potter" movies, was recently photographed chilling out on the Los Angeles set of the new flick. The red and black tattoo can be seen on her back as she bends over while sitting down on a lawn chair, as seen in pictures posted on the Web site of US Weekly magazine.

Watson also wore what appeared to be brunette hair extensions, as well as Daisy Dukes, a black leather jacket and strappy high-heeled sandals.

"The "Bling Ring" began filming in March. The movie is set for release in 2013 and also stars Leslie Mann, who portrays her mother, Kirsten Dunst, Bush singer Gavin Rossdale and Taissa Farmiga, the younger sister of actress Vera Farmiga, who is also known for her role as Violet Harmon in the FX series "American Horror Story."

"Filming 'Bling Ring' is going great," Watson said on April 3 on her Facebook page. "It's so amazing to get to play a real character. And I get to be funny! Awesome!"

Watson took time off from shooting the film to attend the 2012 Coachella Valley Music and Arts Festival, where she was photographed getting cozy with her boyfriend, Will Adamowicz, and celebrated her 22nd birthday on Sunday.

"Just enjoyed a birthday feast of Mac N' Cheese, jelly beans and lemonade. Thanks for all the birthday wishes. Much appreciated!! E xx," she Tweeted, adding: "As far as I'm concerned I turned 22 when @flo_tweet sang "What the Water Gave Me" at Coachella x."