Britney Spears, expecting to crank out her second child in the near future, has admitted that she and dirtbag husband Kevin Federline didn't plan the pregnancy.

"It just kind of happened," the 24-year-old singer told People. "I'm going to wait a while for the next (one)!"

Or so you think. You can't FADE K-Fed's seed.

Spears is mom to 11-month old son Sean Preston, the couple's first child, and is already eight months pregnant again. Having back-to-back pregnancies can be stressful, she says -- adding that she feels like she's been knocked up for 10 years -- but she adheres to the advice of her mom, Lynne, and takes 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. It makes me feel needed and wanted, so I like it too," Britney said.

Spears says she and Federline, 28, don't know the gender of their baby-to-be. The pop princess plans to hit the gym and begin hard core dieting soon after having the baby, scheduled via Caesarean birth, as was Sean P.

She's not ignoring her cravings at this point, though.

"Crunching ice and chocolate, oh my God. I'll get up in the middle of the night and I'll get a Hershey's bar, the real big ones, and I'll put it in the microwave and melt it and eat it. It sounds disgusting, but it's so satisfying."

Even more satisfying for Federline is the BLING he is gonna rake in by impregnating Britney at every turn. The T.H. Gossip office pool for the birth of Spears' third child has already begun.