They've been one of Hollywood’s favorite couples for quite some time now, but it is being reported that Vanessa Hudgens and Zac Efron have called it quits on their relationship. According to Us Magazine, the “High School Musical” co-stars have split after spending more than three years in the spotlight together.With their romance having started as the two were paired up as co-star leads in Disney's "High School Musical," a source close to the couple now claims of the breakup, "It was mutual. They have been together for so long. It just ran its course." And, the insider insists, "They are still talking and still friends. There's no drama. No one cheated. They just grew up."