MAMA SMURF: “It’s part Wonder Woman, part Smurf,” Katy Perry said of the outfit she wore to the Jean-Charles de Castelbajac show, involving a blue wig and retro specs. The singer, in town to play a concert at the Zenith, was without a chaperone, her husband Russell Brand having left town the night before. “We are both workers,” shrugged Perry. “She’s super cool, she’s so fun and fresh,” commented admirer Yelle (born Julie Budet), who will be supporting Perry next week for the British leg of her tour. Singer Mareva Galanter, who is de Castelbajac’s partner, said she is currently touring with Nouvelle Vague and working on her third album.