Britney SpearsBritney Spears and husband Kevin Federline are reported to have spent a week in Las Vegas with ten friends to celebrate Kevin’s 28th birthday.

The couple stayed in the £4,000-a-night penthouse suite in the Venetian Hotel and had dinner in a private dining room at the hotel before heading over to party in the Pure Club in Caesar’s Palace.

Reports vary as to the total bill for the celebrations but they seem to point to somewhere in the region of £50,000 - not including the private jet that took them there.

Britney, who may or may not be pregnant with their second child together, and Kevin were very much the happy couple according to an onlooker: “They didn’t leave each other’s side all night. They danced together – Britney was doing all her famous dance moves. Toward the end of the night, they were all over each other – kissing and hugging, having a great time.”