JAMIE Foxx is at it again. The actor, who recently ridiculed Miley Cyrus on his radio show, laid into Rihanna during a party at Tao in Las Vegas the other night. "Jamie took over the microphone and started doing a show. Halfway through, he asked Rihanna to join him onstage," said our spy. She was there with Jay-Z and looked "annoyed" at the request, said our tipster. "Rihanna declined, but Foxx continued to badger her." The deejay played "Umbrella" and "that was the last straw" for the Barbados-born beauty. "She got up to leave, and Jamie told the deejay to stop the record," said our source. Foxx shouted, "You can't go while your song is playing. Relax." Our witness said, "Rihanna stayed and pretended to enjoy herself, but it was so obvious she was fuming. As soon as the song was over, she got the hell out of there." Rihanna's rep declined to comment and Foxx's rep didn't return calls and e-mails.

JAMIE Foxx is at it again. The actor, who recently ridiculed Miley Cyrus on his radio show, laid into Rihanna during a party at Tao in Las Vegas the other night. "Jamie took over the microphone and started doing a show. Halfway through, he asked Rihanna to join him onstage," said our spy. She was there with Jay-Z and looked "annoyed" at the request, said our tipster. "Rihanna declined, but Foxx continued to badger her." The deejay played "Umbrella" and "that was the last straw" for the Barbados-born beauty. "She got up to leave, and Jamie told the deejay to stop the record," said our source. Foxx shouted, "You can't go while your song is playing. Relax." Our witness said, "Rihanna stayed and pretended to enjoy herself, but it was so obvious she was fuming. As soon as the song was over, she got the hell out of there." Rihanna's rep declined to comment and Foxx's rep didn't return calls and e-mails.