Rihanna And Jay-Z Ring in the Fourth in Vegas

The singer finds plenty of company when she celebrates the Fourth of July in Sin City

While Chris Brown partied with Diddy in L.A., Rihanna heated up Sin City for the holiday weekend with Jay-Z.

After watching his performance at the Pearl Theater at the Palms, Rihanna and Jay-Z headed to Tao for a late dinner with an entourage of 30, including Jamie Foxx and LeBron James.

The songbird was rocking a black blazer with nothing underneath except silver pasties and sequined skintight pants!

After chowing down on sea bass and chicken fried rice, the group got a surprise from a generous guest...

A customer sitting nearby the celebs sent over 20 bottles of Ace of Spades champagne for Jay-Z, Rihanna, Jamie and LeBron!

Jamie quickly got on the mic and performed a Michael Jackson tribute, along with his hit "Blame It."

Jay-Z called it an early night, but Rihanna lasted for a few hours as she sipped champagne and hung with her crew.

So while it sounds like Diddy has Chris Brown's back, Ri-Ri's got Jay-Z and Jamie in her camp. If the reports of Chris getting cozy with Kanye West's ex Amber Rose are true, we're guessing Kanye will be joining Team Rihanna, too!