Why Kelly Osbourne Hid For 9 Months During Pregnancy: 'I Saw What They Did to Jessica Simpson' (Exclusive)

Kelly Osbourne says she remained completely out of the spotlight while she was pregnant so people couldn't make fun of her weight gain

Pregnancy can be magical for some, but for Kelly Osbourne, it was accompanied by the stress of her changing body.

"I gained 100 lbs," Osbourne, 38, tells PEOPLE of carrying her son Sid, now 15 months.

Osbourne says she was so wary of people mocking her weight gain that she didn't even let them see her pregnant and instead hid out at her parent's place for the entire nine months.

"Long story short, I saw what they did to Jessica Simpson and I thought it was disgusting," she says, nodding to when Simpson was mocked by trolls for her pregnancy weight gain.

Related: Kelly Osbourne Says She's Never Had Plastic Surgery — Here's What She Does Instead (Exclusive)

"I was so frightened that would happen to me too that I hid. I just didn't want pictures out there. I didn't want to face it, and have people be like, 'Oh she's a moose!' So I just cut the problem out."

Osbourne notes that the weight gain wasn't fun: "I had gestational diabetes. So I couldn't even eat what I wanted to," she says. But she also says she cherished the quality time spent with her dad Ozzy, and it ended up being the best nine months ever.

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"My partner Sid [Wilson] was on tour, so I just moved back in with my parents and hung out with my dad and we did everything together," she says.

"We played Jenga, we played cards, we had like 20 different TV shows we were watching at once. He would go on my diet and I'd go on his diet, and then we'd work out in the pool together, because his physical therapy was similar to what I was supposed to be doing. We had the best time together."

Osbourne says that after Sidney was born, she immediately worked hard to lose the weight.

"I was in danger of getting real diabetes, so I stuck with the same diet I was on before. No sugar, no carbohydrates, lean proteins, lots of vegetables for fiber, and then the little things like don't eat the bread basket, cut out the soda," she says.

Related: Kelly Osbourne Was 'Hungry for 9 Months' After Cutting Carbs While Pregnant Due to Gestational Diabetes (Exclusive)

In retrospect, she wishes she'd been gentler on herself about both gaining and losing the baby weight.

"I was not gentle on myself," she says. "It's something I'd be mad at myself for. I didn't need to hide."

She says she hopes to have more kids, and next time she'll be less stressed about it.

"I want as many as I can squeeze out before it's too late!" she says. "But next time I think I'll be braver, and not hide out for the entire nine months."

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