The Prom King and Queen apparently had an amicable split and there's no scandalous reason behind the breakup.
"It was mutual," a source told Us Weekly. "They have been together for so long. It just ran its course."
They've barely been photographed together in the past few months and when asked about the relationship in recent interviews they seemed bored of each other.
Zac recently told Details magazine, "Believe me, I rack my brain thinking, 'Why am I not out there playing the field?' One of my buddies was like, 'You have no idea what’s going on right now. You’re peaking on Ecstasy and you’re watching TV.' But it's not in my heart.”
I'm a little bummed to hear about the breakup but I bet Zac's buddy is thrilled. On to the next one...