The 35-year-old actress and her 31-year-old rocker beau couldn't keep their hands off each other for their grown-up date night.
Fox and MGK ditched their children for a night out at Six Flags in Valencia, CA.
The Transformers actress dressed to kill, but her outfit probably made it uncomfortable for theme park fun.
Slaying in tight black jeans, Fox slipped her hourglass curves into a clinging sheer corset -- something that's definitely not your typical ride-ready outfit.
Wearing combat boots, the actress grabbed her boyfriend's hand as he ushered her past the crowd and eager photographers.
If the couple was trying to go incognito, MGK's wardrobe didn't help.
The rocker commanded attention in a bright pink sweatshirt and matching sweats. Unlike Fox, he kept warm from the cool L.A. air in a white jacket.
MGK looked crazy in love and unable to keep his hands to himself during their Tuesday date.
It's a bold move to hit the theme park sans kids, especially since they neglected to invite their children to Disneyland when they hit up the Happiest Place on Earth in June.
Fox is a mom to three sons -- Journey, 4, Bodhi, 7, and Noah, 8 -- who she shares with her estranged husband, Brian Austin Green.
As for MGK, he has a daughter -- Casie Colson Baker, 11.
Fox recently gave an interview from the couple's home and her kids playfully kept popping in the shot. She also played stepmom to MGK's daughter last weekend while he was playing a surprise show in Venice.
So, why weren't the kids at Six Flags with their parents?
It's definitely interesting considering Fox has taken a whole lot of heat from her soon-to-be ex-husband.
Fox -- who's notoriously quiet on social media when it comes to her children -- recently called out Brian Austin Green on social media. She accused him of "using" their children on Instagram to make her look like a bad mom.
Unfortunately, going to Six Flags without your kids definitely loses you some brownie points.