Customers at the Four Seasons restaurant yesterday were treated to a bosomy bonus with their Dover sole. To help powerbroker Vernon Jordan celebrate his 75th birthday with Blackstone Group co-founder Pete Peterson, a buxom blonde came to their table and sang “Happy Birthday” a la Marilyn Monroe. Then, she flashed him. “She was wearing a bustier. She pulled it down and just stood there for 30 seconds topless in the middle of the Grill Room. People were just startled,” said a witness. The woman got a standing ovation from the likes of Donald Marron, Steve Forbes and Felix Rohatyn. Turns out she’s Becky Wunder, a food blogger who runs a site called Wunderful Kitchen. Between teaching recipes online, Wunder works as a massage girl at strip club Rick’s Cabaret, where a rep wouldn’t say who hired her for $500 for the Four Seasons stunt. But it had co-owner Julian Niccolini‘s fingerprints all over it.