Kelly Osbourne engaged?

Kelly Osbourne wearing the ring

Kelly Osbourne has sparked rumours she is engaged.

The 23-year-old star - who shot to fame on fly-on-the-wall MTV show 'The Osbournes' with her rock star dad Ozzy, mother Sharon and brother Jack - was spotted wearing an diamond ring on her engagement finger on Tuesday night (23.09.08).

Kelly and 18-year-old model Luke Worrall, who have only been dating for four months, were enjoying a romantic evening in London when she began waving the impressive band around to a crowd of photographers.

The loved-up couple couldn't keep their hands off each other as they dined at Japanese restaurant Nobu in London's exclusive Mayfair district.

They then partied at the Bungalow 8 nightclub with a group of friends including Kelly's brother Jack and model Kimberley Stewart.

Kelly, who was first seen wearing the diamond band in July, has dismissed claims she is planning to tie the knot.

Her spokesperson said: "No, she's not engaged. The ring was actually a present from her dad Ozzy."