Chris Brown has opened up for the first time in an interview with the Mirror about his assault of Rihanna in 2009, calling the vicious attack the "deepest regret of my life."

Four years too late may be the thought running through most heads, but Brown hopes his apology for the incident to the U.K. publication can help smooth over recent backlash to their reconciliation. Brown was attending Elton John's Aids Foundation Oscars fund raising party in Hollywood when he came out with the admission to the Mirror. 

Out of character might be how some described his humble admission of guilt. "Sometimes you row, you fight, with the one you love and things get said, stuff spirals" the singer said. "That night was the deepest regret of my life, the biggest mistake. But she loves me - what can I say? I'm forgiven... but, yes, I worked hard for it."