United Kingdom, Jan. 23 -- Kristin Cavallari's children inspired her to "pull back" about taking about her sex life.

The 39-year-old star - who has Camden, 13 Jaxon, 11, and Saylor, 10, with ex-husband Jay Cutler - had to "really pause" when her sons told her their friends had heard her and then-boyfriend Mark Estes, 26, discussing intimate details about their bedroom antics.

Speaking to guest Rachel Bilson on her own Let's Be Honest podcast, Kristin said: "I'll definitely pull back, and I feel like I've found this way to kind of say stuff without just saying it.

"So this is actually the one thing that made me be like, 'Whoa, I need to watch what I'm saying.'

"[My sons] told me recently that, like, a year ago or something when I was d...