Winehouse, who recently left a London rehab where she was undergoing treatment for drug addiction, has performed only a handful of times in recent months.

People.com said the Grammy Award-winning artist sang before a crowd of about 600 guests, including Jessica Alba, Kanye West, Rihanna, Mary-Kate Olsen, Ashley Olsen, Sofia Coppola, Milla Jovovich and Jade Jagger, at a party for Fendi's new Avenue Montaigne boutique during the weekend.

"Forgive my ignorance, I don't know anything about fashion," Winehouse, who was wearing a black Fendi dress for the occasion, told the audience.

She performed a set that included "Rehab," "Valerie" and "You Know I'm No Good" and told the crowd in between songs she was "really glad to be booked by Fendi because I was getting bored," People.com reported.

"I'm available for bookings," she quipped. "If anyone wants me for a wedding or a bar mitzvah. ... Well maybe not a wedding. My music's a little too heartbreak. For a wedding, you need something meeker."