NAOMI CAMPBELL - CAMPBELL AND USHER 'ON THE ROCKS'

Supermodel NAOMI CAMPBELL's relationship with R+B heart-throb USHER is reportedly on the rocks - because the singer's entourage are too controlling.

The pair have been dating since October (04) and have been regular features on the social scene since, gracing the red carpet at a number of awards ceremonies.

But pals claim the fledgling romance is already in trouble - because Usher and his management expect too much of the catwalk queen.

A source tells PAGESIX.COM, "They are having problems. They aren't seeing each other right now.

"(Usher's camp are) very controlling and wanted Naomi to behave a certain way and do as they say - including showing up to every red carpet event with him and posing for every picture. She was sick of it."

The model's spokesperson ROB SHUTER refused to confirm a split, but hinted, "Naomi and Usher have always been great friends and will continue to be great friends."