From supermodel to supermom!

Jack Osbourne's new wife Lisa (nee Stelly) gave birth just seven months ago, but a source tells Us Weekly she's already a pro with daughter Pearl.

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The former model "is like Supermom," the insider says. "She made this huge transition from model and party girl, to wife and unbelievably devoted mom!"

Thanks to her intense preparation prior to her daughter's arrival, Lisa now has plenty of knowledge about what it takes to raise a happy, healthy baby -- and she's set on sharing that know-how with internet users around the world.

"She started a mommy blog [RaddestMom] because she has literally read every book, and is becoming a baby expert," the source says. "She would like to maybe write a book for first-time moms -- it's something she has started thinking about."

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From the sounds of things, Jack's parenting skills are just as impressive as his spouse's: In May, Jack's older sis Kelly told Us the documentary filmmaker is also a natural with his little girl.

"He's so good with the baby," she gushed. "It's unbelievable."

This article originally appeared on Jack Osbourne's Wife Lisa Stelly Is a "Supermom!"