The pop singer Rihanna isn't exactly making many friends on the benefit circuit. Two weeks ago she canceled on a cancer fund-raiser in Los Angeles and Cee-Lo Green stepped in at the last minute.

On Saturday, she was meant to perform at yet another fund-raiser in Palm Beach, this for the Dana-Farber Cancer Institute and the Jimmy Fund, at Mar-a-Lago with Donald and Melania Trump watching. But at the last minute, the singer canceled yet again, still blaming bronchitis, and Jennifer Hudson stepped in.

Apparently, Rihanna had enough energy to celebrate her birthday on Saturday at the CAA building at a party for All-Star Weekend and the Two Kings charity in Los Angeles with Ciara, Drake, Jamie Foxx, Vin Diesel and Ryan Phillippe. Just after midnight, a spokeswoman for the event said that Rihanna and Jay-Z celebrated her 23rd birthday with a shot as the DJ played her new single "What's My Name."

Despite the lack of a certain pop star, much of New York was down in the Palm Beach area: Dylan Lauren signed her new book in South Beach; Jill Kargman signed hers, "Sometimes I Feel Like a Nut," at the Chanel store on Worth Avenue in Palm Beach, and the artist Andrew Levitas showed a slew of his new Florida-based photographs at the Arcature Fine Art gallery across from the Chanel boutique.