Zac Efron and Vanessa Hudgens were "constantly touching and kissing" last Friday night.

The pair - who ended their five-year romance last month - fueled rumors they have reunited with their flirty behavior at the opening of SHG's Eden Hollywood when they arrived with mutual friend Brittany Snow late in the evening.

"Vanessa was bopping around with her arms up while Zac had his hands all over her. Vanessa had a smile on from ear to ear and the two were inseparable after that," a source said to People.

Following their public display of affection on the dancefloor, Zac, 23, and 22-year-old Vanessa then retreated to a table - and grew even more affectionate. "Zac sat in between her legs and she wrapped her arms around him. They were making out on and off for the last hour or so until closing. They acted like there was no one else in the room."

The former couple narrowly escaped being pictured together but as he leaned in for a kiss, Vanessa pushed him away after spotting a fellow reveler with a cameraphone. "They were kissing on the lips and seemed to be enjoying their night. They seem to be back together."