(JosiahW / TK / Splash News; David McNew/Getty Images;Alo Ceballos/FilmMagic)

Chris Brown has officially broken up with his model girlfriend, Karrueche Tran, according to his rep.

"I have decided to be single to focus on my career. I love Karrueche very much but I don't want to see her hurt over my friendship with Rihanna. I'd rather be single allowing us to both be happy in our lives," Brown said in a statement via his publicist.

Brown and his ex-girlfriend Rihanna were reportedly spotted together at the Jay-Z concert in Brooklyn Wednesday. One concert goer posted a photo to Instagram of the pair reportedly sitting next to each other at the show, with Brown's arm draped around Rihanna's chair. The pair was also spotted at New York City hang out Griffin, where a source told E! News the singers were dancing and getting close.

Tran tweeted Wednesday, "Bye baby."

"There's a difference between a man and a boy," she tweeted one day earlier.

Brown and Tran started dating in February. The R&B star is still on probation from beating Rihanna in 2009.