Are Zac Efron and Vanessa Hudgens Back Together?

So much for those Rumer Willis rumors.

Just weeks after they shocked the celebrity gossip world with their split, Zac Efron and Vanessa Hudgens looked to be back together at last night's SHG's Eden Hollywood opening.

They were "constantly touching and kissing each other," a witness told People.

Efron and Hudgens arrived together (alongside Brittany Snow) and quickly hit the dance floor.

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

It really was back to old times for the duo, adds the insider: "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."

After arriving with pal Brittany Snow around midnight, the actors quickly took to the dance floor. "Vanessa was bopping around with her arms up while Zac had his hands all over her," the source says. "Vanessa had a smile on from ear to ear and the