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