Having a new baby at home hasn't extinguished the sparks between Christina Aguilera and Jordan Bratman!

The new parents are so determined to keep their two-year marriage red-hot that they've taken to skinny-dipping by moonlight. The couple can be heard loudly frolicking in the pool of their $11.5 million Beverly Hills mansion around midnight.

"They don't just splash around �" they laugh, scream, swear and make sexy noises," says a source. "We're happy that they're happy, but we wish they'd keep it down a bit. There are a lot of old people who live around here, and they don't like noise after the dinner hour."

Still, the 27-year-old pop singer and her record producer husband, 30, are preferable to the house's former owner, Ozzy Osbourne, adds the source. Ozzy �" who sold the Mediterranean villa after wrapping up his MTV show, The Osbournes �" would blast "horrific, ear-splitting rock music."

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