Kelly Osbourne denies pregnancy reports

Kelly Osbourne has laughed off reports she is expecting her first child.

Ozzy Osbourne's daughter sparked pregnancy speculation last week (ends08Sep13) when she suggested her breasts are swelling, posting a photo of herself on her Instagram.com page with the caption, "My t**s are getting so big therefore I am the fiercest of them all!"

However, the 28 year old, who is engaged to vegan chef Matthew Mosshart, is adamant she isn't preparing for motherhood just yet.

She tells People.com, "I have no idea what's happening to me - my boobs have grown very large and I don't know why. Everyone is like, 'You're pregnant, you're pregnant!' and I'm like, 'No! That's not happening!'"

Osbourne insists the rumors about her new curves haven't upset her, adding, "It's kind of fun, though. It's nice to have them for once."