NEW YORK (AP) -- Rihanna is finally speaking out after she was allegedly attacked by boyfriend Chris Brown — telling fans she's strong and doing well.

A statement released by her representatives Friday says she won't comment on "the incident involving Chris Brown" at the request of authorities.

But it says she's grateful for fan support. It also says she's strong, and doing well.

The statement also acknowledges she's going through "a difficult time."

It comes hours after the Web site TMZ released a photo that purportedly shows the battered face of Rihanna. Brown is being investigated for attacking a woman sources say is Rihanna hours before the Grammy awards earlier this month.

Friday marks Rihanna's 21st birthday.