Reports: Zac Efron, Vanessa Hudgens split

Actors Vanessa Hudgens and Zac Efron arrive at the premiere... — Actors Vanessa Hudgens and Zac Efron arrive at the premiere of Universal Pictures' "Charlie St. Cloud" at the Village Theater in Los Angeles on July 20, 2010. Credit: Getty Images

By FRANK LOVECE. Special to NewsdayDecember 13, 2010

"High School Musical" co-stars and real-life sweethearts Zac Efron and Vanessa Hudgens have broken up.

"It's nothing dramatic," a source told E! Online, which first reported the split Monday. "There's no third party involved."

Echoed a source in Us magazine: "No one cheated. They just grew up . . . It was mutual. They have been together for so long. It just ran its course."

Efron, 23, and Hudgens, who turns 22 Tuesday, met in 2005 while filming the first "High School Musical" telefilm, and became romantically involved either the following year, according to People magazine, or in 2007, according to Us. However long they were together, "they are 100 percent still good friends," a source told People.

Efron is filming "The Lucky One," based on a Nicholas Sparks novel. Hudgens next stars with Dwayne Johnson and Michael Caine in "Journey 2: The Mysterious Island," a sequel to "Journey to the Center of the Earth."