Jack Osbourne Expecting First Child

Less than two weeks after announcing his engagement, Jack Osbourne has more news: He and his fiancé, model and aspiring actress Lisa Stelly, are expecting a baby.

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The former reality star announced the news Tuesday on CNN's Piers Morgan Tonight.

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"I'm excited," he said. "I'm a little nervous."

This will be the first child for the couple, who announced their engagement Sept. 29.

"The most amazing man I've ever met asked me to marry him ... and he wasn't joking! Crazy, right," Stelly tweeted at the time.

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Osbourne rose to fame along his family -- parents Ozzy and Sharon and sister Kelly -- on their MTV reality show The Osbournes. Earlier this year, he produced a documentary about his famous rocker dad called God Bless Ozzy Osbourne.

His mom most recently co-hosted daytime talk show The Talk.