Chris Brown is  opening up about his rocky relationship with Rihanna.  The British newspaper the Mirror  caught up with the singer at Elton John's AIDS Foundation Oscar fundraising  party Sunday where he admitted that he's learned a lot since the night of his  now infamous attack on his pop star girlfriend.

He called the incident the deepest regret and biggest mistake of his  life.  Brown didn't go into the actual details about the altercation, but  he did indicate that a fight spiraled out of control. 

He was arrested and eventually sentenced to five years probation for  the attack on Rihanna, in addition to coming under fire from many in the  entertainment industry. 

Chris says he was only able get through the intense scrutiny because of  the support he had from his fans and those close to him.  He says his fan  base has been incredible. 

Brown also spoke about his  recent reconciliation with Rihanna.  Since their break up, Chris says the  two have done some "serious making up."  He adds that he worked hard to  earn Rihanna's forgiveness. 

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