Britney just can't seem to keep her panties on these days. While I never saw this one coming, I think Kevin Federline is actually acting more responsible these days. The former pop queen shacked up with barely known model Isaac Cohen at the Hugh Hefner suite of a Las Vegas hotel on Saturday, it has been reported by UTC news.

The pair stayed in the Fantasy Tower wing of The Palms hotel, in the $40,000-a-night, two-storey Hugh Hefner Sky Villa, which has an 8ft rotating bed, a Jacuzzi, full bar and a glass elevator.

"They seem very happy together," a source said. Britney Spears and model-and-actor Isaac Cohen, both 25, were seen dancing and smoking cigarettes at gay nightclub 8 1/2 for about an hour before returning to their luxury suite.

I'm not sure what is going through Brit-wit's head these days. If she wants custody of her two sons, I don't think partying every night and hooking up with random men is going to be too helpful in court. I think Britney is continuing to show the world that she just doesn't give a damn about what anyone thinks.