Celebrity son Jack Osbourne, engaged to Lisa Stelly, has announced that he's going to be a father. This is the 25-year-old's first child.

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The son of Sharon and Ozzy Osbourne said on "Piers Morgan Tonight" Tuesday, "I'm excited. I'm a little nervous."

Jack's fiancée, 26, expressed her happiness after announcing their engagement, writing on Twitter, "The most amazing man I've ever met asked me to marry him... and he wasn't joking!"

Baby Bump Watch 2011

Beyonce

Beyoncé made a surprise announcement at the 2011 MTV Video Music Awards, when she took to the stage and said, "Tonight I want you to stand up on your feet; I want you to feel the love that's growing inside of me." Knowles and her husband of three years, Jay Z, are expecting their first child together.

Robert Downey Jr. and Susan Downey

"Iron Man" star Robert Downey Jr. and his wife of six years, Susan, are expecting their first child together early next year.

Brenda Song and Trace Cyrus

Disney star Brenda Song, 23, and her beau, Trace (Miley Cyrus' brother), 22, are expecting their first child together.

Jason Bateman and Amanda Anka

Jason Bateman and his wife of 10 years, Amanda Anka are expecting their second daughter.

Jennifer Garner

Jennifer Garner and Ben Affleck announced they were going to be parents for the third time. The couple have daughters Violet, 5, and Seraphina, 2.

Fantasia

"American Idol" alum Fantasia Barrino announced she was pregnant during a charity concert on July 31 in Jacksonville. This is her second child.

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