Jack Osbourne, 25, announced that he's going to be a father with his fiancée, actress Lisa Stelly,who announcing their engagement less than 2 weeks ago!

"The most amazing man I've ever met asked me to marry him....and he wasn't joking!" Stelly, 26, Tweeted last month. "

What is with all the sudden pregnancies by young celebs? will this union last, or is it just an 'inheritance prank?