Chris Brown is ''having fun'' with Rihanna.

The 'Fine China' singer - who has an on/off relationship with model Karrueche Tran - has stayed close to his former girlfriend, who he was convicted of assaulting in 2009, but insists they are just friends.

He said: ''We're friends. Nothing too serious... We're not trying to start a life together right now, we're just having fun.''

Fans have speculated that 'Drunk Texting', a track on the 25-year-old star's new album 'X', is about Rihanna, and while Chris insists it isn't, he doesn't mind theories being shared because he thinks it encourages record sales.

Asked if the track is about Rihanna, he said in an interview on US TV show 'Entertainment Tonight': ''Oh no, not at all. I think that's just the fans' perception or the media's perception at all times because of our history. But whenever we do music, people can make the assumption and that's fine because if they buy more because they think that, then go ahead and buy a thousand copies.

''But as far as me writing and going into that, I don't really try to put my focus on Rihanna every song. At the end of the day it's almost six, seven years later. It's like, how many more times am I going to talk about the same situation?''

Chris - who spent 108 days behind bars for violating his probation when he allegedly made threats about using guns while seeking anger-management treatment in rehab earlier this year - says he has become a more ''humble'' person in recent months and has finally moved past his shocking attack on his former girlfriend by forgiving himself.

He said: ''You have to forgive yourself. You can't beat yourself up over the years, because it'll just eat at you and you'll be stuck in the past. And for me, I just learned to be a more humble individual and more of a conscious person.''