Jack Osbourne and Lisa Stelly: Expecting!

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Lisa Stelly and Jack Osbourne just got engaged.

Now it looks like they're starting a family as well!

"I'm very excited. I'm a little nervous," Jack said upon revealing the happy news that Lisa Stelly is pregnant in an interview on Piers Morgan Tonight.

Stormi Webster Speaks!!!

She missed out on this interview, but sister Kelly Osbourne is obviously a fan of the couple. She's been taking to Twitter to silence her critics already.

Stelly's certainly joining a close-knit family.

"@shabooty shut your f--king mouth!" Kelly told one hater who wrote: "What an idiot, you're not supposed to knock up your model girlfriend :P."

The love is mutual: "Just spent the last hour on the phone with @MissKellyO ... she will be the best sister-in-law ever!

The child will be Jack's first, and the fifth grandchild for Ozzy, but the first for Sharon. Oz's son and daughter from his first marriage each have two kids.

Congratulations to the happy couple!

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