Kevin Federline's Vegas grind

Kevin Federline has been drinking and "grinding" in Las Vegas.

The ex-husband of Britney Spears, who recently filed for primary custody of the couple's two sons, arrived at the Venetian's Tao nightclub with 25 friends on Friday night (17.08.07) and proceeded to down strong shots.

A source told People magazine: "He was drinking straight from the vodka and Jagermeister bottles. I didn't see him with a drink in his hand that much, but he drank out of the bottles a few times."

Kevin and his friends dined at Tao's Loft restaurant at around 11.30pm, before moving on to the club at 1am.

K-Fed, who was wearing baggy jeans and a yellow polo shirt, ordered bottles of Jack Daniels, Grey Goose and Jagermeister for his friends at his VIP table.

He was seen flirting with several girls and later left his own private area to "grind" with a table full of girls nearby.

The source added: "He was grinding up on a few of the girls. He had a flashlight and was shining it on some of the girls around him. He chain smoking and flashing his gold necklace to DJ Reach. Kevin held up a cigarette lighter when Reach played Jay-Z's 'Big Pimpin'."

Kevin, who finally left the nightspot at around 4am, wants to care for his sons, 23-month-old Sean Preston and 11-month-old Jayden James for 70 per cent of the time.

Custody is currently shared equally between Kevin and Britney.