Rihanna bans Chris Brown from having any contact with Alexandra Burke

Rihanna has now banned Chris Brown from having any contact with British pop star Alexandra Burke.

Burke has made no secret of her crush on Brown.

A source tells Britain's Daily Mirror newspaper, "Alex was mortified. She had no idea she had been banned from meeting her idol.

"She's a massive fan of Chris Brown – she said numerous times on The X Factor how much she fancies him and wants to meet him.

"Since she and Chris are both with Sony, she asked label bosses if they could arrange for her to meet him at the after-party.

"They said that was fine, they would sort it out.

"Poor Alex was so excited about hooking up with Chris that she was even thinking of entering a radio competition to meet him."