has debuted her new guy in public at a birthday party at Lexington Social House for pal Ashley Tisdale
's sister, Jennifer. Too bad she isn't back with Zac Efron
, but the new beau just so happens to be a blonde Disney star, too. Keeping it all in the family, eh? The looker's name is Austin Butler
, he's two years younger than Vanessa
, and he actually looks like 90s teen heartthrob, Jonathan ...