Last call means nothing to Zac Efron and Cheryl Burke!

A source tells In Touch that after a long evening of drinking — and serious flirting on the dance floor — at West Hollywood hotspot Bootsy Bellows, the sexy actor, 24, and Dancing With the Stars siren, 28, found a much cozier couch than the one provided in the VIP section for a late-night hookup.

"They hooked up after partying all night together," the insider says.

Although Cheryl's rep denies they left the hotspot together, a source confirms they met up later in the night.

Looks like Cheryl forgot about Joffrey Lupul — the hunky professional hockey player she's recently been linked to. As soon as she saw the High School Musical stud, says the source, "she set her sights on him."