Newly-Engaged Keira Knightley Shows Off Diamond Bling

Enjoying a romantic holiday weekend, Keira Knightley was spotted out and about with her finace James Righton in London, UK.

Flashing her smile and her new left hand bling, the "Pirates Of The Carribean" actress was spotted taking a walk with her beau on both Friday and Saturday (May 25-26), switching up her look with flowing pleaded skirt and black top one day and a plain white dress the next.

After 15 months of dating, James, the Klaxons keyboard player, got down on one knee to swoon Keira with a circular diamond on a thin gold band and, with all the public kisses they have recently been sharing, it seemed to have worked pretty darn good.

As for her professional life, the 27-year-old "never felt more useless" during a UNICEF charity trip to Chad in March when she saw first hand the conditions children were living in, and emotionally disturbed after meeting four-year-old Idris at a rehabilitation centre who is paralysed from the waist down after being diagnosed with polio when he was 18-months-old.

"The worst part of the day came when Idris' dad asked why I was here, if I had come to cure his son. I've never felt more useless in my life. No I can't cure him, I can't make him walk and I wish with every fibre of my being that I could."

In her diary published by British magazine Radio Times Keira added, "[He] is the bravest, most determined little boy I have ever met".

Enjoy the pictures of newly engaged couple Keira Knightley and James Righton out in London (May 25).