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Federline, who has kept a low profile as his child custody battle with ex Spears looms, hit the Venetian's Tao Nightclub in Las Vegas Friday night with a party of 25.
"He was drinking straight from the vodka and Jagermeister bottles," an onlooker said. "I didn't see him with a drink in his hand that much, but he drank out of the bottles a few times."
Federline and his group arrived at the club around 11:30 p.m. and had dinner at Tao's Loft before retreating to the club at 1 a.m., says a source. There, Federline, dressed in jeans and a yellow polo shirt, started the party with bottles of Jack Daniels, Grey Goose and Jagermeister.
Stationed at his VIP table, Federline chatted with a few of the girls surrounding him, and later migrated to the table full of women adjacent to his. "He was grinding up on a few of the girls," the source said. "He had a flashlight and was shining it on some of the girls around him."
Thoughout the night, Federline flashed his gold necklace to the deejay, DJ Reach, and even held up a cigarette lighter when the deejay played Jay-Z's "Big Pimpin'.
Smiling and chain-smoking throughout the night, Federline finally left the club around 4 a.m.
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