Fox, 35, proved she could keep up with the thrill-seeking rock star when she jumped on the back of his hog in a dress, straddling the chopper's metal and holding onto her beau.
Looking like she was enjoying every second of it, the Transformers actress left her worries behind on the open road. Wearing an attention-grabbing pink summer dress, Fox worked extra hard not to flash everyone when she kicked a leg over.
Sporting a red helmet with the number 7, the newly divorced star appeared ready to tackle anything that comes her way during her vacation with MGK.
As for the Forget Me Too musician, his outfit made it impossible not to notice the couple. Sporting a bright tie-dyed shirt and skull shorts, if they were trying to have a low-key holiday without the paparazzi, his shocking attire ruined it.
Fox and MGK paid no attention to the shutterbugs, hitting the pavement at high speeds on their carefree ride on Sunday. The couple was joined by several friends who also partook in the adventure.
Following their ride, Fox and MGK were seen on a romantic stroll arm in arm.
The mom of three held tightly onto her boyfriend's arm while they took in the sights. She was practically glued to his hip and holding on so tightly, you'd have to pry her arm off with a crowbar.
Fox and MGK are currently in Tulum, Mexico, toasting to the actress' divorce being finalized.
As Radar reported, Fox and Brian finalized their divorce last month, nearly one year after she filed. She cited "irreconcilable differences" as the reason for their split after 10 years of marriage.
Fox began dating MGK before the public knew she and Brian had even split. The Beverly Hills, 90210 actor spoke out about their surprising split on his podcast.
Neither one of us did anything to each other. She's always been honest with me and I've always been honest with her," he said at the time. "And I know she will always love me and I know as far as a family, what we have built is really cool and really special. So we decided let's make sure we don't lose that. That no matter what we're always friends with each other and we're a united front with the kids."
As for Fox, she's been in bliss with MGK ever since.