Zac Efron and Lily Collins' spring fling is over.
After just three months together, The Lucky One actor, 24, and the Mirror Mirror actress, 23, have split, multiple insiders confirm to Us Weekly exclusively.
"They're no longer together. They were never serious, though; it was just a casual thing and it fizzled," one insider explains. "They were never in the same place at the same time."
A second source adds: "Zac was never very serious about her. He didn't talk about her to friends."
The stars were first spotted holding hands during a friend's birthday dinner at L.A. eatery STK February 8. After that, the low-key stars -- who have been photographed together only once -- only grew further apart.
"It's true that their schedules are crazy right now, which isn't conducive to a relationship being easy," a pal tells Us.
Prior to his relationship with Collins, Efron was in a longterm relationship with his High School Musical costar Vanessa Hudgens, 23. Collins and her Abduction costar Taylor Lautner, 20, ended their courtship in September 2011.
This article originally appeared on Usmagazine.com: Zac Efron, Lily Collins Split