Jack Osbourne's fiancé Lisa Stelly has given birth to a baby girl. Weighing in at 8lbs 6oz, the little one has been named Pearl by her proud parents, according to Hello! magazine.

The couple - who announced their engagement last September after a four-month romance - were expecting their first-born to arrive last Wednesday. Taking to Twitter on Tuesday night, Jack said, "Well @lisamarstelly is supposed to give birth to our baby tomorrow. Fingers crossed."

But by Friday, there was still no progress when Lisa Tweeted, "Still pregnant. Apparently I made too lovely of a home int here! #overit #comeonbaby. (sic)"

Jack's sister Kelly was just as eager to meet her niece, and already has plans for girlie shopping trips:

"I don't have the words to express how excited I am about it. I'm so proud of Jack and Lisa. I couldn't stop crying when I saw the ultrasound of their baby girl. Jack loves his privacy and he's turned out to be one of the most respectful, well-rounded and honest gentleman around. The two of them are going to make great parents. I can't wait to style my niece. I've already told him I'm going to steal her and take her out shopping."

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