In case a reunion with Vanessa Hudgens' isn't in the cards, there's always their mutual BFF Ashley Tisdale. They've been friends for years and raised a lot of eyebrows last summer when they got flirty at her beach birthday party. It's only natural that their close friendship would evolve into something more -- especially if Ashley ever breaks up with boyfriend Scott Speer again. Also fun to note: She was Zac's lucky guest to "The Lucky One" premiere on April 16. That's right -- out of all his friends, he picked Ashley.