Scott Disick and Sofia Richie's romance is hotting up.

Scott Disick and Sofia Richie

Scott Disick and Sofia Richie

The 'Keeping Up With The Kardashians' star was seen kissing the 19-year-old model - who is the daughter of Lionel Richie - as they jet-skiied in Puerto Vallarta.

After spending time at the beach in Mexico, the couple headed back to the swimming pool where they enjoyed some PDA in the hot tub.

It comes after a source insisted Scott and Sofia are "officially" hooking up.

They said: "Things became official over the past week while they were in New York City together ...

"It's so weird. Not just the age difference, but mostly the fact that Sofia had been a family friend for years, and was close to Kendall and Kylie [Jenner]."

And Sofia is said to be "smitten" with Scott.

An insider added: "Since returning to LA, Scott and Sofia are inseparable. They are spending every day together. Sofia seems smitten.

"It's obvious that she looks up to Scott. She constantly giggles around him. They are very flirty. Scott takes care of her, opens the car door and pays for everything."

Back in June, Sofia had insisted the pair were just good friends, writing on Twitter: "The last time I'm gonna say it. Scott and I are just friends. I'm single and focused on friends, family and work. #againrelax (sic)"

And in another tweet, she added: "Just so everyone can get their panties out of their a**es, Scott and I are just homies #relax (sic)"

Scott Disick split from Kourtney Kardashian, his partner of nearly a decade, back in 2015. However, the couple - who share three children, Mason, seven, Penelope, five, and Reign, two - have remained friends and are committed to co-parenting their kids.

Since his split from Kourtney, Scott has been romantically linked to a number of women including actress Bella Thorne and his former flame Chloe Bartoli.

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