Caitlyn Jenner loves to rev her engine!

On Thursday, the former Olympian and her son Burt Jenner spent the day together at a Las Vegas racetrack.

The duo posted about their day of fun in the sun on Instagram. Caitlyn shared a snap leaning against one of the cars in her sexy racing ensemble. What a stunner!

She captioned the shot, "It's a fun day!! Out celebrating by driving with @bjenner. Take a look at these fun toys :) #vroom #needforspeed #raced."

Caitlyn's 37-year-old posted some snaps himself of him and his dad in matching ensembles.

The proud son wrote, "We had a blast today out in Las Vegas! Thanks for the fun @exoticsracing @exrseries #MyDadLooksBeautiful."

They really are a modern family!

We had a blast today out in Las Vegas! Thanks for the fun @exoticsracing @exrseries #MyDadLooksBeautiful

A photo posted by Burt Jenner (@bjenner) on