Fun in the sun!

The couple was seen taking it easy on a boat as they soaked up the sun and spent some quality time together on Friday.

Richie, 20, wore a white T-shirt with a pair of denim shorts, while Disick, 35, opted for a grey top with a pair of casual bottoms. Dressing for the weather, the pair accessorized their looks with sunglasses.

Although they have yet to share any photos from their vacation online, Richie posted plenty of photos from Kardashian’sbirthday celebrationas she cuddled up with palParis Hilton.

“Forever spirit animal,” she wrote alongside one photo of the pair smiling together at the star-studded fete.

Paris Hilton and Sofia Richie.Sofia Richie/Instagram

Sofia Richie and Paris Hilton

Sofia Richie and Paris Hilton

In honor of the special occasion, the model dressed to impress, opting for a form-fitting one shoulder gown with a thigh-high leg slit.

Disick was also in attendance at his ex’s bash, and was pictured partying in Kim Kardashian West’s Instagram story.

Scott Disick.Kim Kardashian/Instagram

Scott Disick Kim Kardashian

Ahead of the party, a source told PEOPLE that the mother of three feels “excited” about her milestone birthday and is in a “great place” with Disick.

“When she talked about turning 40 a while back, she didn’t seem too excited,” said the source. “Turning 40 is a big deal. But instead of seeing it as something negative, Kourtney turned it around and she seems very excited about her life just in general.”

Kourtney Kardashian/Instagram

kourtneykardash1

“She’s been through a lot, personally, over the last decade and feels she’s come out stronger and happier,” adds the source, sharing that after years of ups and downs, she and Disick have put their drama “behind them” and are focused on raising their three kids:Reign, 4,Penelope, 6, andMason, 9.

“It hasn’t been easy, but now she’s in a great place with Scott,” the source said.

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And part of working together to co-parent their children means taking family vacations together, which are increasingly including Richie.

Earlier this month, theKeeping Up with the Kardashiansstarjetted off to Finlandfor her kids’ spring break, an insider previously confirmed to PEOPLE. In addition to her three children, Disick and his girlfriend also joined the snowy getaway.

“The family trip was for the kids’ spring break. This is why Scott and Sofia came along,” the insider said, adding, “They spent several days in Finland and had a great time. It was a lot of snow so the kids had fun.”

Kardashian, Disick and Richie also went on vacation together last Decemberin Cabo San Lucas, Mexicowith the kids in tow.

Disick had a sense of humor about traveling with the atypical group. “What more can a guy ask for. THREE’S COMPANY,” he captioned anInstagram imageshowing the trio relaxing on recliners — with Kardashian on his right and Richie on his left.

Later that month, Richie joined the Kardashians and Disick on afamily trip to Aspen, Colorado.

A source told PEOPLE at the time that Richie is continuing to navigate the complicated family dynamic with Kardashian.

“She loves Scott and wants to be with him,” the source said. “She loves being around Scott and his kids.” The insider also shared that Richie is happy to have built up some trust with Kardashian and “proved to Kourtney that she is great with her kids.”

source: people.com