Zac Efron and Vanessa Hudgens
The High School Musical stars' relationship turned romantic two years after starring in the 2005 TV Movie. In December 2010, the teen couple officially called it quits. "It was mutual. They have been together for so long. It just ran its course," an insider told Us. "They are still talking and still friends. There's no drama. No one cheated. They just grew up."