MashGet

In Rihanna's first sit-down since Chris Brown assaulted her in February, the pop star explained to Diane Sawyer what happened the night that the attack took place, confirming the rumor that it all began over an argument about a text message Brown had received.

"We had a blast that night," she said in the part of the interview that aired on "Good Morning America" Friday (November 6). She went on to describe how the fun night spent at a pre-Grammy party soon escalated into violence after she confronted him about a text messages she found from an unknown woman on his phone.