Kelly Osbourne, 23, is engaged to her 18-year-old model boyfriend Luke Warroll, so says his Facebook.

According to a Sunday newspaper, Luke yesterday changed his online relationship status to ‘engaged to Kelly Osbourne'.

His profile page has been inundated with congratulatory messages from friends and family.

Relative Nicola Worrall wrote: ‘I'm pleased for you both xx', while former babysitter Claire Merchant added: ‘Wow, you've come a long way from the little boy I used to love babysitting for'.

Luke is thought to have had the stamp of approval from Sharon Osbourne at a lunch meeting in July, but it is unclear what her reaction is to news of an engagement.

There's just something about fame that makes ya want something stable, and marriage is seen as an institution that provides stability. Sigh. They'll break up by 2010.

Good luck and congrats!