R&B star Ciara has denied rumours of a romance with 50 Cent.

The singer, who duetted with 50 on her single 'Can't Leave 'Em Alone', admitted that she has been "amazed" by recent reports which suggested that they are dating.

"He's a really great friend. For some reason, with this friend, everybody turns everything into something else," Ciara told People magazine.

"They said we have a ranch in Atlanta. I just died laughing. It's amazing to hear the things people make up. It's funny."

Ciara celebrated her 22nd birthday in Manhattan this week.