Double date!

After celebrating sisterKylie Jenner‘s21st birthdayin Los Angeles last week,Khloé KardashianandKendall Jennerjetted off to Puerto Vallarta, Mexico, with their respective NBA star boyfriendsTristan ThompsonandBen Simmons, plus a few friends.

BACKGRID

Kendall Jenner and Khloe Kardashian heat things up in Puerto Vallarta!

Clasos Press/Splash News

Khloe Kardashian and Kendall Jenner are joined by Tristan Thompson, Ben Simmons and friends at Joe Francis’s home in Mexico

A source previously told PEOPLE that while Jenner and Simmons’ romance is heating up, the model remains“very protective”over it. (She has yet to publicly address their relationship.)

“She’s being very private about her relationship with Ben,” the source said. “Kendall’s really different from her sisters in that sense.”

“She honestly doesn’t want people talking about who she’s dating and is very protective of her personal life,” the source added. “She hates the attention.”

RELATED VIDEO:Kendall JennerandKourtney KardashianPose in Sexy Bikinis for ‘Low-Key’ Memorial Day Weekend

Jenner and the NBA player firstsparked romance rumorsearlier this summer and have frequently been photographed together since, including at Kardashian’sFourth of July party.

“She’s having a good time with him,” the source said. “She’s excited to spend the summer with Ben.”

Meanwhile, Kardashian and Thompson have seemedinseparable in Los Angelesever since welcoming daughterTrue— and weathering hischeating scandal— in April. The Cleveland Cavaliers player missed Jenner’s blowout birthday bash last week due to a charity event in honor of his younger brother Amari, who suffers from epilepsy, but the couplesoon reunitedfor a night out on the town.

source: people.com