Christina AguileraChristina AguileraChristina Aguilera has joined the Hollywood Mom Club.

And she's likely to be painting her nursery blue.

The pop star welcomed her son, Max Liron Bratman, into the world on Saturday at Cedars-Sinai Medical Center.

She shared the news with her fans on her official website:

"Today is a very joyful and special day for Jordan and I as we welcome our first son into this world."

Initial reports over the weekend claimed that Xtina had given birth on Friday but they were a tad premature.

Instead, at 10.05pm on Saturday little Max popped into the world, weighing 6lbs 2oz.

Friday in fact belonged to Nicole Richie, who gave birth in the same hospital to a little girl, Harlow.