Chris Brown: up, down, all over town

Collaborates with Rihanna, on music anyway

By Lesley Abravanel2/21/2012

Beloved and/or despised Grammy winner Chris Brown was everywhere this weekend.

On Saturday, he celebrated his win at Cameo with close friends, Young Money rapper Tyga and Busta Rhymes and an entourage of women. Brown was feted with an enormous cake designed as a Grammy and took over the DJ booth with Tyga, who performed his hit Rack City.

Brown performed three of his own hits (Another Round, Strip and Look at Me Now.) Brown was rushed by a throng of adoring fans before leaving the club at 4:30 a.m. He was also seen Thursday night at Arkadia at the Fontainebleau and at the Miami Heat game Sunday with Lil Wayne. According to The New York Daily News, he still had time to tweet a happy 24th birthday message to his ex Rihanna; rumors were flying via Twitter that the couple might be getting back together. They are doing a musial collaboration: Two songs featuring the singers hit the Internet on Monday. Brown sings on the remix of Rihanna's "Birthday Cake." She's on the remix of his "Turn Up the Music."

Brown tweeted a link to the new version of "Turn Up the Music" on Monday, and Rihanna later retweeted it. She also tweeted about the remix for "Birthday Cake."

@chrisbrown Turn up the music remix #RihannaNavy #Teambreezy enjoy!!!" the Barbadian tweeted out to her fans, along with a link to a remix of Brown's hit "Turn Up the Music," which he performed at the Grammys.

He was originally here for the Premio Lo Nuestro awards, doing a duet with Pitbull, International Love.

Brown attacked his then-girlfriend Rihanna at a pre-Grammy Awards party in 2009. He pleaded guilty to a felony charge and is serving five years of probation.