Is Chris Brown romancing a new R&B diva?

He's already collaborated with Keri Hilson musically, and last night, Chris "was all over" Keri at the Axe Lounge at Liv.

A source tells E! News that the two were "grinding each other" on the dance floor, and Chris even made a special request...

"He insisted on her being in a photo with him as well," a source tells us.

The two left together, along with a group of friends.

No word from either of their reps, but Keri posted the following on her Twitter:

"LMAO paps think they slick!! Gone ask CB & I to tk a pic on carpet then asked da crew if we datin!! LHLAB so, no! I'mma let yall know now :P"

We'll let you decipher for yourself, but that sounds like a denial.

Ironically, Liv is the same place Brown's ex-girlfriend Rihanna hosted the Pepsi Refresh party just two nights earlier.

Is "Nelena" the hot new couple?

Nick Jonas and Selena Gomez have stepped out twice together this week!

Tuesday night, the two (who reportedly dated in 2008 after his split from Miley Cyrus) hit Philippe restaurant in Beverly Hills for dinner. And although they were dining with a large group in the private wine room, a source tells E! News "they were by each other's side the whole night."

Their first date was a little more low-key. After Nick did the "We Are The World" recording Monday night, the Disney duo went bowling together.

When the lights go down on the Staples Center Sunday at the Grammys, Lady Gaga, the five-time nominee, will be there to get the festivities rolling. And she won't be opening the show alone with an inevitably crazy outfit.Elton John will be there to join her, E! News confirms exclusively.