Zac Efron & Vanessa Hudgens have split up!?! Sources close to the High School Musical co-stars tell OK magazine that  Efron & Hudgens have officially gone their separate ways.

According to the source, while Zac was away in Europe promoting Hairspray, Vanessa was at a Hollywood Hills party, where eyewitnesses say she was “all over” her older, not-Zac date. And when someone dared to ask about Zac, Vanessa “threw a fit and said ‘don’t mention his name!’ “