Caitlyn Jenner and son Burt satisfy their need for speed as they spend a day racing muscle cars

She took up motor racing after her Olympic track career ended, instilling a love of fast cars in her oldest son when he was a child and she was his dad.

So it’s little wonder Caitlyn Jenner joined 37-year-old Burt for a day satisfying their need for speed.

The pair turned up at the Circuit Of The Americas track in Austin, Texas, on Saturday to race exotic cars.

Ready to race: Caitlyn Jenner and her son Burt spent Saturday satisfying their need for speed by racing muscle cars on the Circuit Of The Americas track in Austin, Texas

Cait, 66, arrived in a pink blouse and jeans before changing into her black leather driving gear, which matched her heavily bearded son’s get up. Caitlyn shares Burt with his first wife, Christie Scott.

Both were emblazoned with the EXR Exotics Racing logo, which offers the opportunity to get behind the wheel of a supercar for as little as $199 for five laps at its tracks in Las Vegas and Los Angeles. It also sponsors a national racing series.

EXR’s muscle cars include souped up Ferraris, Porches, Mercedes, Lamborghinis, Corvettes, McLarens and Aston Martins among others.

Gearing up: The 66-year-old reality star arrived in a pink blouse and jeans before changing into a black driving outfit, which matched her heavily bearded son’s get up

He’s a good boy: The 37-year-old supertruck racer helped his mum get into her helmet as she stood by her car

Both Caitlyn and supertruck racer Burt posted snaps on Instagram.

‘My ride for the day :),’ Caitlyn captioned a sleek grey car. ‘Looking forward to race day with @bjenner !!!’

Burt shared a shot of a sporty white model, captioned, gleefully: ‘Well, I think the new car looks good… Out here at #circuitoftheamericas #COTA about to put the first mile on this brand new car… Life is rough…’

Ready to go: ‘My ride for the day :),’ she captioned a sleek grey car. ‘Looking forward to race day with @bjenner’

‘Life is rough’: Burt also posted a double snap of his Exotics Racing wheels, saying, ‘about to put the first mile on this brand new car…’

He also posted shoutouts to Zenna Tires, Exotics Racing, UFD Racing and Venice, California-based micro brewery House Beer.

Meanwhile, the couple spent the previous weekend on the Exotics Racing track in Las Vegas.

Burt, who passionately defended Cait throughout her transition, posted a collage of them together with their rides.

He captioned it: ‘We had a blast today out in Las Vegas! Thanks for the fun @exoticsracing @exrseries #MyDadLooksBeautiful.’

Mother and son: Burt and Cait also went racing last weekend when he posted this snap, saying: ‘We had a blast today out in Las Vegas! Thanks for the fun @exoticsracing @exrseries #MyDadLooksBeautiful’

Pricey rides: Burt added this shot showing them both with their cars, ready to race