Christina Aguilera Photo by: Noel Vasquez / Getty
Christina Aguilera: Oh Baby! | Christina Aguilera
At just a month old, Max Bratman is fussing, and his parents – pop diva Christina Aguilera and her husband, Jordan Bratman – are playing a guessing game familiar to every mom and dad: Tired? Hungry? Gassy? The two keep their cool as they try a trusted bag of tricks for soothing their son. First it's his favorite blue blanket. No luck. Then the baby swing that's "worth every penny," says the proud papa. Not this time. Finally Aguilera picks up her son, cups his small head and sings a soft melody. The little boy instantly quiets down, his squirmy body relaxes, and his tiny fingers reach up to his mom's cheek. "I'm head over heels in love," says the singer, her signature shock-red lipstick traded in for soft pink. "He's completely changed my life."

For a pop superstar with a supersexy image – this is a woman who got "Dirrty" in a provocative '02 music video – life has suddenly gotten very domestic. Although she's won five Grammys and sold 37 million records, Aguilera is relishing a deluxe maternity leave, spending quality time serenading an audience of one. "When he's breast-feeding, I just sit there and stare at him," says the singer, 27, whose version of mommy mode (flawless makeup and a comfy, chic ensemble of a striped sweater, black leggings and silver slippers) is Hollywood glam. "I'm in awe of this little miracle." Adds Bratman, 30, a Bronx-born music exec who married Aguilera in a $2 million wedding in Napa Valley in 2005: "It's brought us even closer together. He's a product of our love."

Luckily, little Max Liron Bratman (combined, his Latin first name and Hebrew middle name roughly translate to "our greatest song") is so far a "sweet, mellow baby" who inherited his dad's brown hair and his mom's ability to turn heads. "He's a good combination of both of us," says Aguilera. "He smiles a lot already, and he has the same little Elvis side smile that I do." What about her lung capacity? "He's not a big crier, so he hasn't really belted it out yet!" He's also no stranger to show business – Aguilera was about to start the last three-month leg of her world tour for her Back to Basics album when she learned she was pregnant. "I couldn't figure out why I was late," she says with a laugh. "I really doubted I was pregnant. But I took a test and it was positive, and then I took another test and it was positive. My jaw dropped and I started tearing up." Says Bratman, who was in New York at the time: "When I got home there was a whole line of [pregnancy] tests!"