EHKK FLPI/AKM-GSI; Getty Images
The Neighbors star was spotted, overnight bag in hand, apparently leaving Michelle's Los Angeles home on Sunday, the pair having enjoyed a night out with pals on Saturday at Chateau Marmont.
Zac was also carrying a skateboard as he eased his way out through a side entrance and made his way to his car, his morning hair tucked under a baseball hat.
An eyewitness exclusively tells E! News that Zac and Michelle were hanging out in the back garden of the West Hollywood hot spot with a group that included Robert Pattinson.