Always on Vacation! Scott Disick and his girlfriend Sofia Richie, seen cosying as they enjoy a romantic break in Mexico (Details, pics)

They've enjoyed vacations to Miami, Puerto Vallarta and Italy since going public with their romance in September.

And on Friday, Scott Disick and Sofia Richie were spotted enjoying some sunshine in Los Cabos, Mexico. The father of three, 34, and the 19-year-old daughter of Lionel Richie were seen relaxing on loungers together during their holiday.

Sofia flashed her flat stomach in a loose gray crop top with low-slung baggy patterned bottoms. The teen added a gold necklace for a touch of sparkle to her otherwise low key ensemble.She pulled her platinum blonde locks back into a low ponytail, opting for a deep side part.

Sofia appeared to peek over boyfriend Scott's shoulder before sitting down on a lounger next to him. Scott donned his swimsuit trunks for his sun tanning session with his teen girlfriend.

Sofia and Scott, who has three children with ex partner Kourtney Kardashian, took a private plane to Los Cabos.

Sofia shared a snap of her large Hermes Birkin bag and Scott's Louis Vuitton backpack to her Instagram story. The doting dad posted a photo to Instagram showing off the plane.

According to People, their relationship is 'starting to fizzle. 'People's insider said that the teenager thought Scott 'would be more serious about their relationship' but she's getting 'more frustrated with him as time goes on.'

The magazine's source added that 'they're starting to argue more' and that it's 'bothering Sofia.' Sofia and Scott went public with their romance in late September, however they were linked as far back as May.

Adding: 'Everything everyone has been telling her to look out for, she's starting to see for herself.'

In September, they spent time together during a romantic trip to Miami.Scott and the teen enjoyed a PDA filled trip to Puerto Vallarta, Mexico at the start of October.

Just weeks ago, Sofia and Scott jetted off to Milan and Venice, Italy for a brief holiday.