She was just a teenager when she dated Brody Jenner after appearing on the wildly successful MTV series Laguna Beach.

But it appears as though Kristin Cavallari and her ex Brody still have some chemistry.

Asked if sparks were flying on the set between the two on the upcoming season of The Hills: New Beginnings, Brody told ET Online: 'I mean, Kristin and I, we have a past. Kristin and I have dated in the past.

'It was always going to have chemistry between Kristin and I. I love Kristin, she's great. You know, we get along, and she's a lot of fun, for sure.'

Brody's Hills co-star Spencer Pratt agreed a 'serious romance' would have been likely between the pair had Kristin stayed around longer on set.

'I think if we had Kristin for, like, a month then, you know... some serious romances would've gone down,' he told the site.

'[Brody] said they were about to start making out on the rocks on the beach. I was like, "What?" And so this was off camera, serious, and I was like, "Maybe she should stay longer."'

Kristin's arrival was teased in a dramatic first-look of the upcoming second season.

The Hills vet could be seen strutting out of a car in a sexy black frock before sharing a toast with a friend.

The screen went black as Kristin could be heard saying, 'To being reunited.'

Kristin and Brody were seen back in February filming The Hills: New Beginnings on the beaches of Malibu together, where they cosied up on the rocks and enjoyed a drink.

Kristin was 18-years-old when she enjoyed a short-lived romance with Brody not long after appearing on Laguna Beach.

The couple ended their year-long, on-off relationship in 2006.

'I dated Brody when I was 18, right after Laguna Beach, actually, and that's it,' she previously told Bethenny.

'And then on the show, on The Hills, they had us 'dating' for a few episodes,' she added.

Years after ending her relationship with Brody, Kristin married Jay Cutler and welcomed three children with him: Camden, eight, Jaxon, seven, and Saylor, five.

She filed for divorce from the former Chicago Bears football player in 2020.

Brody was also married briefly to Kaitlynn Carter after tying the knot in an unofficial ceremony in Bali in 2018.

Season two of The Hills: New Beginnings will premiere on MTV on May 12.