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Jack Osbourne and fiancee Lisa Stelly, are new parents, having welcomed a daughter into the world. Congratulations on the arrival of their baby girl!

Her name: Pearl Osbourne arrived weighing 8 pounds and 6 ounces, according to a Hello magazine tweet that was re-tweeted by Jack and then other sites.

“Well @lisamarstelly is supposed to give birth to our baby tomorrow,” the 25-year-old father tweeted last week. Guess Pearl knew how to be fashionably late!

Jack Osbourne and All Three Children

“Still pregnant,” the 26-year-old new (but exasperated) mama tweeted Friday. “Apparently I made too lovely of a home int here! #overit #comeonbaby.”

But at last, she made it.

“Thank you all so much for your congratulations but they realy [sic] should be gonig to @lisamarstelly & @mrjacko! I am one proud Auntie!” added his sister Kelly Osbourne.

“Today I witnessed my first grandchild being born, life changing experience,” tweeted Jack’s mother, Sharon Osbourne. “She is an angel.”

Ozzy Osbourne has four other grandchildren, as well. Jack got engaged to Lisa Stelly in the fall of last year. Congratulations to all!