Party of three!

They'll have a newborn to look after come summertime, so on January 19, Kourtney Kardashian, 32, and Scott Disick, 28, escaped to Mexico for what she tweeted was "an unforgettable vacation."

SEE US WEEKLY'S PHOTOS OF KOURTNEY KARDASHIAN'S BABYMOON

During the four-day trip to pal Joe Francis' Punta Mita estate, the beaming E! stars romped on the beach with their son Mason, 2, and squeezed in couple time.

"Scott and Kourt just took walks all say on the beach together," a source tells Us Weekly. "Scott also played with Mason while Kourtney relaxed. They were in complete family mode."

PHOTOS: See Mason's baby album

Click here to see more pics of Kardashian showing off her baby bump.

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly