Chris Brown Dances to "Somebody That I Used to Know" With Lots of Enthusiasm >>Hollywood

Fresh off his split with Rihanna, Chris Brown got his groove on at a post-MET Gala bash, dancing to Gotye's breakup anthem with a lot of enthusiasm.

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Breezy "strutted in" to the party and proceeded to make his presence known without even getting up to talk to other guests, an onlooker tells Us Weekly.

"He was putting on a show, dancing, screaming to 'Somebody That I Used to Know' with lots of enthusiasm ... he was really into the message of the song."

Ouch. Take that, Rih.

Later, the club played a song by his ex, "Only Girl in the World," and Brown hit the dance floor with a female friend. The two danced "more casually."

So, now you're up to date on the mindset of Chris Brown, who celebrated his 24th birthday last week sans Rihanna (but with his other ex Karrueche Tran).

Brown recently opened up about his breakup with Rihanna in an interview with an Australian DJ, confirming that it's over and "Im'ma do it solo."

"I mean, at the end of the day, shawty doing her own thang, she on the road. It's always gonna be love. I'm a grown man, just gotta fast forward."

"I'm always gonna love that person. But people have differences and people have different wants and needs. And at the end of the day, she's a young girl."

I can't really be focused on wife-ing somebody that young."

"For me, right now, I just need to focus on being the best