Keira Knightley Shows Off Ring as She Smooches Fiancé

By Tim Nudd

UPDATED 05/28/2012 at 07:30 PM EDT • Originally published 05/28/2012 at 11:30 AM EDT

Keira Knightley was flashing more than her megawatt smile Sunday in London – she also showed off her engagement ring from James Righton.

The British actress, 27, who is newly engaged to the Klaxons keyboard player, 28, was sporting what appeared to be a circular diamond on a thin gold band as she strolled around town with her fiancé – the two of them kissing much of the way.

The pair were dressed for early summer – England has been hit by a heat wave in recent days – with Knightley in a denim skirt and white T-shirt and Righton in light pants, a white T-shirt and a striped long-sleeve shirt.

RELATED: Keira Knightley Is Engaged to James Righton

Knightley and Righton have been together for about a year, following the actress's split from Rupert Friend.