Britney Spears doesn't know about birth control

Britney Spears, expecting baby No. 2, says she and husband Kevin Federline didn't plan the pregnancy. "It just kind of happened," the 24-year-old singer reveals in an interview in the latest issue of People magazine, on newsstands Friday.

She adds, laughing: "I'm going to wait a while for the next (one)!"

At eight months pregnant, Spears is mom to 11-month old son Sean Preston, the couple's first child. "I feel like I've been pregnant for 10 years!" she says.

Having back-to-back babies can be stressful, she says, but she adhere's to her mom's advice to take it "one day at a time."

"It is now starting to get a little tiring, holding (Sean Preston), but the whole pregnancy I've done it a lot because he's very attached," she tells the magazine. "It makes me feel needed and wanted, so I like it too."

Spears says she and Federline, 28, don't know the gender of their baby-to-be. The little one and its big brother "are going to be so close together, it's going to be weird. But I love it," she says.

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