(Cover) - EN Showbiz - Vanessa Hudgens is "having fun" with Disney star Austin Butler.

The couple were first linked over the weekend after they went to a birthday bash for Ashley Tisdale's sister. Although they kept things friendly at the party, afterwards they stepped their affection up a gear.

They were spotted sipping from the same milkshake at Bob's Big Boy restaurant in Studio City, Los Angeles, and canoodled once their refreshments were finished.

"Vanessa is having fun and you can tell she just really likes him," a source told E! News.

It's believed Austin, 20, and 22-year-old Vanessa spent the whole weekend together as he was seen leaving her home on Monday morning.

The pair are yet to decide whether the romance is serious though, with Vanessa said to be more interested in having a good time at the moment.

"He's mister right now," the insider explained.

Vanessa split from Zac Efron in December 2010 after three years together. Since then she's been linked to Josh Hutcherson, although both have insisted they became friends while shooting Journey 2: The Mysterious Island.

Austin appeared in the High School Musical spin-off movie Sharpay's Fabulous Adventure as well as Zoey 101 and Life Unexpected.

He currently features in Disney show Switched at Birth. (C) Cover Media