Christina Aguilera's Pregnancy Was A Surprise, Singer Reveals To Marie Claire

'People thought I was trying to keep it this big, bad secret, and that's not the case at all,' she says.

She's been called one of the greatest vocalists of our time, but for months, pop superstar Christina Aguilera remained silent on her pregnancy. But after first confirming her status to Glamour UK earlier this month, the 26-year-old singer goes into detail about her child, her husband and what to expect when you're an international superstar who's expecting in the upcoming issue of Marie Claire.

(Head here for photos of Christina in all her pregnant glory.)

Although rumored since early July, Aguilera's pregnancy with husband Jordan Bratman was mostly speculation until Paris Hilton let it slip at a party before the MTV Video Music Awards on September 9. For Aguilera, the loose-lipped announcement was an uncommon intrusion into a generally private life, but she said she took it in stride.

"I just wasn't commenting. I'm not being like, 'Hey, everybody, I'm pregnant!' I'm not that girl," Aguilera told the magazine. "Because I hadn't said anything, people thought I was trying to keep it this big, bad secret, and that's not the case at all."

In fact, Aguilera said she had revealed her pregnancy to quite a number of people, including her band and dancers, before Hilton's faux pas.

"I wanted to make sure they had my back," she said.

The admission was part of an overall plan designed to keep her and her baby as safe and healthy as possible, while also continuing her Back to Basics tour, which still had a month to go when Aguilera learned of her pregnancy. (She told the mag that she believes she got pregnant while on the show's Washington, D.C., stop). The show, which includes 10 costume changes and somewhat dangerous stunts, made Aguilera "paranoid" about endangering her child, she said.

"There are so many things that could go wrong — somebody could slip, somebody could fall, I could fall. There was no way in hell I was going to jeopardize my baby for my show," she insisted, admitting to that she wore a hidden heart monitor to keep track of her body's homeostasis. "[I took precautions, but] I didn't want to make the audience uncomfortable, like, 'Pregnant lady onstage! Is she going to be OK?' "

The extra steps were necessary because of what Aguilera now admits was a surprise conception.

"We were planning on starting to try after the tour. And so I had gone off the pill to prepare my body, because I didn't know how much time it would take," the singer confessed. "You've heard it takes some time — except with Power Egg and Super Sperm here. ... I'm like, 'Oh, my God, can you believe it just happened?' "

The newest issue of Marie Claire, with the full interview and a very pregnant, half-naked Aguilera on the cover, hits newsstands December 11.