Chris Brown kicked off his weekend-long birthday celebration sans Rihanna.

The "Ready" crooner, who turns 24 Sunday, partied the night away at Emerson Theater in Hollywood Friday night. 

And while his on-again, off-again ladylove wasn't in attendance, his ex-girlfriend Karrueche Tran was, making her way into the club with friend Christina Milian to help him ring it in.

"LA, VEGAS, NEW YORK! Celebrating this WEEK on to the next week! ‪#birthdayturnup," Brown tweeted Tuesday.

Brown is scheduled to continue his celebration at 1 OAK nightclub at the Mirage in Las Vegas tonight.

So, where in the world was Rihanna?

The "Stay" singer, who landed in NYC Friday morning for her Diamonds World Tour, tweeted, "Yes I do!!! ‪#BROOKLYN," along with an Instagram snap. 

Rihanna is scheduled to perform Sunday and Monday at Barclays Center in Brooklyn, and has made no mention so far of Brown or his birthday on the social networking sites. 

Safe to say these two are off again?

—Reporting by Christopher Hall

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