Fenty reportedly told the magazine that when he first heard about her alleged altercation with [artist id="1961441"]Chris Brown[/artist], "I didn't believe it. I know my daughter," he said, adding about Brown, "You think you know somebody, but you really don't."
The alleged incident took place before the Grammy Awards last Sunday. Brown was arrested and released on bail; [artist id="1940303"]Rihanna[/artist] is reportedly cooperating with police.
"At some point, she will speak out," he added. "I hope she will stand up for women all over the world."
Fenty said Rihanna is currently spending time with girlfriends in Barbados. Although he said he wouldn't tell his daughter what to do, he added, "If it were me, I'd move on."
Fenty said the last time he had seen Rihanna and Brown together was in July. "They seemed pretty happy," he said. "I don't know what went wrong."
On Friday, the magazine published an interview with Brown's biological father, Clinton Brown.
"He's reflecting on this situation," Brown said of his son. "He's very remorseful. He's very concerned about the situation and he wants to make sure that [Rihanna's] OK. This is unfortunate, this stumble, this situation," Brown added. "Hopefully, he will get past it. We all have our shortcomings. We all trip."
Get resources and information about domestic violence, or check out Think MTV for a video handbook on spotting the warning signs of abuse.