Vanessa Hudgens is back with Zac Efron. Or is she?

After announcing their split in December, Vanessa Hudgens and Zac Efron appeared to be more than friends at Friday evening’s SHG’s Eden Hollywood opening, where they were “constantly touching and kissing each other,” an onlooker told PEOPLE.

“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,” the source said.

Vanessa Hudgens and Zac Efron arrived with their friend Brittany Snow around midnight and they quickly took to the dance floor.

Eventually heading towards a table, the couple proceeded to get cozy – and stay that way for the rest of the evening.

“Zac sat in between her legs and she wrapped her arms around him,” the onlooker notes. “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.”