Usher is slamming Chris Brown over weekend photos that show the troubled 19-year-old singer smiling and riding around on jet skis in Miami.

"I'm a little disappointed in this photo," Usher says about the shots of Brown. "After the other photo [of Rihanna's bruised face posted by TMZ]? C'mon, Chris. Have a little bit of remorse, man. The man's on jet skis? Like, just relaxing in Miami?"

Brown -- who is to be arraigned Thursday for allegedly assaulting Rihanna Feb. 8 in L.A. -- and Rihanna were staying at a house owned by Sean "Diddy" Combs on Star Island.

Though Rihanna wasn't spotted, Brown was photographed several times over the weekend, smiling, riding a jet ski and flexing his arm muscles. Despite reports, he did not party with Khloe Kardashian and Reggie Bush Saturday night at the Gansevoort South Hotel.

Both Brown and Rihanna were photographed arriving in L.A. Monday.