Kristin Cavallari and Jay Cutler
02/27/2014 at 05:00 PM EST
What baby bump?
looked fit as ever wearing a strappy black bathing suit during a family getaway.
The former Hills
star shared a beachy Instagram
on Thursday, capturing her, husband Jay Cutler
and son Camden
, 18 months, strolling through the sand.
Cavallari, 27, and the Chicago Bears quarterback are expecting another boy
this spring. But you wouldn't know it based on this snapshot: The photo is taken from behind, showcasing Cavallari's very flattering Mikoh swimsuit. Based on Cavallari's caption, she knows she looks like one hot mama.
"Been having a beautiful, relaxing family va-cay," she wrote. "Thanks @mikoh_ for the perfect preggers bathing suit."