The two, who started dating when they were just teenagers costarring in the hit High School Musical franchise, recently called it quits.
"It's nothing dramatic," one source said. "There's no third party involved."
Says another source, "They were together for so long. It just ran its course."
Sources insist they remain friends.
Efron, 23, is currently filming The Lucky One in New Orleans. Hudgens, who turns 22 tomorrow, wraps Journey 2: The Mysterious Island later this week in Hawaii.
Source: eonline