Emma Watson showed some ab — and a temporary back tattoo! — yesterday on the LA set of Sofia Coppola's The Bling Ring. Decked out in a leather jacket and bra-like top, Emma Watson showed some skin in her day's costume. British Emma has been on the West Coast for the past month shooting the project with Sofia and a range of costars that include Kirsten Dunst, Leslie Mann, and Gavin Rossdale. Her character's somewhat racy look is a departure for Emma, who's known for her elegant and polished red-carpet style. Emma may break from the movie work this weekend, though, since Sunday is her 22nd birthday.