Gwyneth Sings with Jay-Z

Remember when we told you Gwyneth celebrated her birthday with her new BFF Beyonce? It looks like they did a lot more than just drinking. They also attended his concert and joined Jay onstage as well. The evidence we have here in the form of this video is not the best, but you'll get the idea. Gwyn has expressed her interest in becoming a popstar, but we think she should concentrate on her acting career.

And Chris Martin gets in on the action too....