Their relationship has been a famously high-octane romance.

And Megan Fox and Machine Gun Kelly were once again turning up the heat as they hopped on a motorcycle together on their latest vacation on Sunday as they zipped around in the sunshine.

The Confessions Of A Teenage Drama Queen actress, 35, was seen holding onto the pop punk rapper, 31, as they hopped on a two-wheeler during their trip in Tulum, Mexico over the weekend.

Need for speed: Megan Fox and Machine Gun Kelly enjoyed a motorcycle ride while on vacation in Tulum, Mexico on Sunday

Megan showed off her legs in a H๏τ pink mini dress with a nipped in waist and backless detail which showed that she appeared to go braless as she straddled the motorcycle behind MGK.

She did not wear the most traditional footwear for hopping on a motorbike as she donned white patterned slide sandals for the ride yet did keep her head protected as she sported a shiny red helmet.

After the ride, she opted for more fashionable headwear as she donned a large, fuzzy sun visor.

MGK – real name  Colson Baker – definitely drew attention as he sported a mesh neon orange and yellow long-sleeved top with pink patterned shorts and white low-top sneakers. He accessorized with a baby pink trucker cap and neon green translucent sunglᴀsses.

Hop on: The 35-year-old actress looked happy to join the 31-year-old pop punk rapper

Pin parade: Megan showed off her legs in a H๏τ pink mini dress as she straddled the motorcycle behind MGK

Interesting: She did not wear the most traditional footwear for hopping on a motorbike as she donned white patterned slide sandals for the ride

They were joined by several pals who rode ATVs alongside the power couple.

The two have been enjoying a trip south of the border after a separate vacation in Greece the previous week.

Megan and MGK’s whirlwind relationship began last year while filming Randall Emmett’s crime thriller, Midnight In The Switchgrᴀss, with Bruce Willis, Emile Hirsch and Lukas Haas in Puerto Rico.

Safety first: The Transformers actress did keep her head protected, however, as she sported a shiny red helmet

Good times: Megan looked at the two-wheeler before hopping on

Wow factor: The star looked gorgeous as ever