Pull out the Vaseline - manufactured diva hopeful, Alexandra Burke, is trying to push up on Breezy, and RiRi is not having any of that:

Rihanna is keeping boyfriend Chris Brown on a tight leash - she has banned him from having any contact with British pop star Alexandra Burke, according to reports. Burke - who won the British equivalent of American Idol, X Factor, in December last year - has made no secret of her crush on Brown.

So, in a bid to keep any love rivals at bay, Umbrella hitmaker Rihanna reportedly banned Alexandra from an after-party following 19-year-old Chris gig at Londons O2 Arena earlier this month. A source tells Britains Daily Mirror newspaper, Alex was mortified. She had no idea she had been banned from meeting her idol.

Shes 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.

Look at Lil Miss Sunshine playing dirty. We didnt know she had it in her. Sounds like shell do whatever it takes to keep them heffahs away from her man. Handle it.