Rihanna and Chris Brown Totally Hooking Up

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Rihanna and Chris Brown have said they're just pals.

That worked really well for Hayden Panettiere and Milo Ventimiglia.

Rihanna: Wedding Dress?

Despite public speculation that they're getting it on, the "Umbrella" collaborators have been coy about the nature of their relationship.

"We're just friends... We hang out," Chris Brown, 18, said at a Grammy Awards after-party on February 10.

Two days later, however, they were spotted walking hand-in-hand into a private room at L.A.'s hottest spot, Les Deux.

The occasion? A surprise 20th birthday party for Rihanna!

After the crowd - which included Kanye West and Wilmer Valderrama - belted out "Happy Birthday," Chris stood up and serenaded her with his own version, and she was beaming. He grabbed her after the song and kissed her!

The source adds that aside from his friendly dance-off with Wilmer Valderrama (he won, we hope) that night, Chris Brown and Rihanna "constantly had their hands all over each other and were rarely apart."

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