Jason Derulo has denied rumours that he and X Factor winner Alexandra Burke are more than friends.

The US singer, 20, said: "I think she is a nice girl, very down to earth and lots of artists out there are not like her. She is actually a really sweet girl."

"We are just friends," he insisted.

While he may be riding solo at the moment, Jason did hint at what he looks for in a girlfriend.

"I am pretty open. I think there are beautiful women in all shapes and sizes and colours, so I am really open," he said.

The Florida born star is currently on tour. His first UK performance will be at London's Shepards Bush Empire on August 19.