In a new interview with Too Fab, she said: 'We were staying at this hotel and there was a nude beach. So at the end of the trip, we were like, "Well, when in Rome!
"'We were just being silly and we had so much fun together.
Earlier this year, she caused quite the stir, when she shared an Instagram shot of her NFL player husband Jay Cutler bearing his bottom during their Mexican getaway.
And Kristin Cavallari has now revealed that the cheeky snap was taken at a nude beach in Tulum, where they enjoyed a romantic springtime getaway in March.
'I did ask him if I could - I wanna clear that up - and yeah, we were just having fun,' Kristin said this week.