Wearing head-to-toe denim (including down to her bikini top!), the model snuggled with her boyfriend as they hung out by the pool with their friends.
"He had his hand on her leg and she was leaning her head into his shoulder," says an onlooker. "They definitely weren't afraid of showing off some cute PDA."
At the next cabana over, Kendall Jenner once again reunited with her sister Kourtney Kardashian's ex Scott Disick while younger sister Kylie hung out with their half-brother, Brody Jenner.
Jenner showed off her festival fashion in a lacy black top and dug into French fries at the bash, where guests snacked on McDonald's All Day Breakfast items and played a giant-sized game of Chevrolet Plinko (the 2016 Chevrolet Cruze was also on display at the party).
"She was having a blast hanging out with her friends and seemed to get along great with Scott," adds the source.
Disick and Jenner also had a friendly run-in at 1OAK's pop-up party, sponsored by Bumble and Casamigos, Friday afternoon.