Here's introducing baby Aguilera.

Christina Aguilera and her little son Max, born Jan. 12 in Los Angeles, posed for photos in People magazine, along with the singer's music executive husband, Jordan Bratman.

"He's completely changed my life," Aguilera says of Max, adding that she is "head over heels in love" with her baby son.

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"When [Max is] breast feeding, I just sit there and stare at him," she says. "I'm in awe of this little miracle."

Aguilera also reveals that she nicknamed the baby Yolky before he was born because her doctor said he looked like a little egg yolk in his sonogram picture.

"Now he's the Baby Formerly Known as Yolky," she jokes.

The magazine also visits Aguilera's California home, which used to be the Ozzy Osborne family home featured in his MTV reality show.

Aguilera, 27, and Bratman, 30, married in 2005.

In the January issue of Marie Claire, Aguilera said she learned she was pregnant while on her recent "Back to Basics" tour.

"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. You've heard it takes some time — except with Power Egg and Super Sperm here," she says. "... I'm like, 'Oh my god, can you believe it just happened?'"