Britney Spears threw husband Kevin Federline a birthday party on Tuesday in his favorite city, Las Vegas, PEOPLE magazine reports.


The singer and Federline, who turned 28 on March 21, arrived just after 8:30 p.m. at the restaurant Tao Las Vegas at the Venetian, where they joined their 10 guests in a private dining room.


Spears was wearing a black halter dress with a very low-cut back, drank a Cosmo, while K-Fed went for a Jack and Coke, shots and beer.


By 10:30, Federline had finished opening his presents and the party headed to Pure Nightclub at Caesars Palace, where Spears snuggled with the birthday boy on the club's VIP bed when she wasn't dancing barefoot to tunes spun by DJ Hollywood.

What is it with Britney she is more often without shoes at the moment???


A clubgoer said:

"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."