The pals were spotted at the 5th annual Los Angeles Haunted Hayride opening night at Griffith Park Thursday in Los Angeles cozying up, with Zac giving Brittany a hug from behind, according to Just Jared.
While it may look like the duo are more than friends in the shot, the actors have actually been close since their Hairspray days back in 2007.
Rumors surfaced back in 2011 that Zac and Brittany had a romance brewing, after they posed together on the red carpet of an event during Golden Globes, but those tales proved to be just a fabrication.
While the words still out on who Zac is really dating these days, Brittany is in a relationship with Teen Wolf star Tyler Hoechlin-they went public with their relationship in April at the premiere of her Lifetime flick Call Me Crazy: A Five Film.
Brittany even gushed about her beau when Tyler celebrated his 26th birthday September 11.
"26 years ago today this amazing guy was born....and no words could ever express how grateful I am that he was. Happy Birthday @tylerl_hoechlin," she wrote on Instagram, along with a photo of them together.
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Gallery | Celebs Love Halloween