Credit: Jason Winslow/Prahl/Splash News Online

Party in paradise!

To celebrate her 32nd birthday April 18, Kourtney Kardashian and her siblings jetted off to Punta Mita, Mexico, for a little fun in the sun -- and lots of romance. Only Us Weekly has the exclusive, sexy shots from the getaway.

Hanging out at the oceanside compound of Girls Gone Wild creator Joe Francis, the birthday gal was joined by her love Scott Disick and their son Mason, 17 months, plus sister Kim, brother Rob and Kim's beau Kris Humphries.

After fiesta the night of their arrival -- featuring cake, presents and mariachi band! -- the group kept things low-key for the six-day stay.

"It was a really romantic getaway," a source tells Us, noting that the locale is where Kourtney and Disick, 27, first met.

And Kim, 30, made the most of her alone-time with Humphries, 26. "They were making out most of the time!" the source says.