Kelly Osbourne fuels engagement rumours by flaunting ring on her wedding finger

They have only been dating for four months but could Kelly Osbourne and Luke Worrall be about to tie the knot?

The couple seemed more loved up than ever after a romantic evening in London last night.

As if to prove her commitment to her model beau, Kelly, 23, certainly wasn't shy when it came time to wave the ring on her engagement finger around in front of photographers.

Engaged? Kelly Osbourne flaunts her new ring as she leaves London restaurant Nobu with boyfriend Luke Worrell

It remains unclear if the daughter of rocker Ozzy and X Factor host Sharon is planning to walk down the aisle with Luke, 18.

But the pair couldn't keep their hands off each other as they went for dinner at trendy Mayfair restaurant Nobu before hitting nearby club Bungalow 8 with her brother Jack and friends including actor Adrian Grenier and Kimberley Stewart.

Kelly wore a cute bowler hat as well as the ring she was first spotted wearing in July.

And although there is still no confirmation of an engagement, the pair's relationship is showing no signs of cooling down just yet.

Happy: Kelly and Luke enjoy a quick smooch in the back of a taxi