Chris Brown Apologizes to Rihanna, Insists He's Sincere on 'Good Morning America' (VIDEO)

In an excerpt from an upcoming '20/20' interview with Robin Roberts which aired on 'Good Morning America,' singer Chris Brown apologized for beating Rihanna, insisted that he's being sincere and indicated he fully understands the severity of his actions.

"I was wrong for what I did," Brown said, who watched and reacted to clips of Rihanna's interview with Diane Sawyer last month. "I would definitely say that it's not something I look past or look over."

Watch the video after the jump.

In an excerpt from an upcoming '20/20' interview with Robin Roberts which aired on 'Good Morning America,' singer Chris Brown apologized for beating Rihanna, insisted that he's being sincere and indicated he fully understands the severity of his actions.

"I was wrong for what I did," Brown said, who watched and reacted to clips of Rihanna's interview with Diane Sawyer last month. "I would definitely say that it's not something I look past or look over."

The R&B singer said he is truly sorry for the part he played in assaulting his former girlfriend and is still reeling from the experience. "Really, I'm ... hurting inside, and it really ... is ... devastating to me," he said.

And, Brown says, he understands how the assault resulted in mental anguish -- what Rihanna called a "scar inside." "I can see what damage it does," he said, "mentally more than physical."

Watch the video from TV's Top 5! below.