Katy Perry Parties With Rihanna...and Her Ex

The new BFFs share a table at Perry's party in New York, where she got cozy with her ex Travis McCoy...get the deets!

New BFFs Katy Perry and Rihanna are still partying together.

After they hung at Clive Davis' bash back in February, the two songbirds were spotted sunning themselves together in Rihanna's home territory, Barbados, last month.

So this time, it was Rihanna's turn to show support and toast Katy's new video, "Waking Up in Vegas," at last night's Svedka cocktail party.

The DJ took requests from both girls, and when Umbrella came on, Katy made Rihanna dance on the banquette with her.

RiRi once again showed off her moves, but she wasn't the only guest Katy was getting down with...

Her ex, Travis McCoy, also was at their table. A source at the soiree says the two exes are "definitely back on."

Katy's rep had no comment.

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