Britney Spears and Isaac Cohen spent the night together in the Hugh Hefner suite of a Las Vegas hotel on Saturday night (13.01.07), it has been reported.

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.

A source said: "They seem very happy together."

Britney and model-and-actor Isaac, both 25, were seen dancing and smoking cigarettes at gay nightclub 8 1/2 for about an hour before returning to their luxury suite.

Staff at The Palms refused to comment.

Last Saturday (06.01.07), the 'Toxic' singer and Isaac were seen together on a speedboat off the coast of Marina del Rey, in California, and they met up the next night at the Whiskey Blue bar of Westwood's W Hotel.

Britney filed for divorce from Kevin Federline last November. The couple have two sons together, 15-month-old Sean Preston and four-month-old Jayden James.