The Hills star and her husband William Tell have welcomed their second child together, a baby boy named Charlie Wolf.
The couple welcomed their first child Liam James into the world on July 5, 2017, five years after they tied the knot in a sunset wedding at a boutique winery.
"It's been hard to keep this one to myself!" she wrote.
Conrad, 33, announced their new son's birth Wednesday on her Instagram account.
The doting mum chose to call her son Charlie Wolf.
She added, 'When you're not sleeping, that's a form of torture!
Th star announced her second pregnancy in April. As it turned out, Lauren absolutely loves being a mother, so her new baby will be blessed with such a doting mommy.
The two-year-old is a very cute presence on her feed, often appearing in costume (bunny ears for Easter, a Santa hat for a Christmas tree shopping outing) or with Tell, looking like a picture-perfect example of harmonious family life. So I took it and I looked at it next to his 1-month photo, and he had just changed.
In September, Conrad posted a photo with a bittersweet message, saying that while she wanted the baby to be born already, she wasn't quite ready.
She later said that she didn't think starring in the reality show did much for her fashion career. "It virtually makes it more tough to leave them".