Grey’s Anatomy‘s Katherine Heigl has been tapped to star in 27 Dresses, a romantic comedy directed by Anne Fletcher (Step Up). Scripted by Aline Brosh McKenna (The Devil Wears Prada), the story is about a single woman (Heigl) who has been a bridesmaid 27 times. She is enlisted as bridesmaid again for her sister, who is is marrying the man she is madly in love with. Production is slated for May, after the actress finishes shooting Grey’s. Heigl chose the project after being courted for several films following the positive buzz on her upcoming movie Knocked Up, directed by Judd Apatow (The 40-Year-Old Virgin).