It's been almost a week since Keira Knightley announced her engagement and we've been itching to clap eyes on her sparkler ever since - and now the wait is finally over.

The actress was spotted wearing the classic diamond ring as she enjoyed a day out in sunny London with her fiance James Righton.

Jewelry Expert Michael O'Connor told Us Weekly: "This is truly the most classic of all engagement ring styles. It's a solid platinum band with a brilliant cut solitaire diamond, approximately 2 carats. Estimated price tag is $40,000 [approx £25,500]"

The couple looked seriously loved-up as they went shopping before they both jumped into a taxi where their PDA continued.

Keira recently splashed out £2.4m on a love nest for her and the Klaxons star to share in London's Spitalfields.

The four-storey house boasts a cinema, dressing room, library and a music room.

The couple - who have been together for 15 months - were introduced by mutual pal and fellow trendy Alexa Chung, soon after Keira finished her long-term romance with actor Rupert Friend.

> IN PICS: THE GLAMOUR WOMEN OF THE YEAR AWARDS 2012

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• Glamour Women Of the Year Awards 2012

  Kylie Minogue

• Glamour Women Of the Year Awards 2012

  Jessica Alba and Jeremy Piven

• Glamour Women Of the Year Awards 2012

  Abby Clancy

• Glamour Women Of the Year Awards 2012

  Alice Dellal

• Glamour Women Of the Year Awards 2012

  Lily Allen

• Glamour Women Of the Year Awards 2012

  Jameela Jamil

• Glamour Women Of the Year Awards 2012

  Claudia Winkleman

• Glamour Women Of the Year Awards 2012

  Jessica Alba

• Glamour Women Of the Year Awards 2012

  Lea Michele

• Glamour Women Of the Year Awards 2012

  will.i.am

• Glamour Women Of the Year Awards 2012

  David Gandy

• Glamour Women Of the Year Awards 2012

  Caitlin Moran and Lily Allen

• Glamour Women Of the Year Awards 2012

  Fearne Cotton

• Glamour Women Of the Year Awards 2012

  Paloma Faith

• Glamour Women Of the Year Awards 2012

  Kelly Rowland

• Glamour Women Of the Year Awards 2012

  Kelly Rowland

• Glamour Women Of the Year Awards 2012

  Eva Longoria

• Glamour Women Of the Year Awards 2012

  Lily Collins and Douglas Booth

• Glamour Women Of the Year Awards 2012

  Viola Davis

• Glamour Women Of the Year Awards 2012

  Cat Deeley

• Glamour Women Of the Year Awards 2012

  Michelle Dockery

• Glamour Women Of the Year Awards 2012

  Dionne Warwick

• Glamour Women Of the Year Awards 2012

  Kylie Minogue and Jake Shears

• Glamour Women Of the Year Awards 2012

  Jessie J

• Glamour Women Of the Year Awards 2012

  Hayley Turner

• Glamour Women Of the Year Awards 2012

  Amanda Holden and will.i.am

• Glamour Women Of the Year Awards 2012

  Jessie J and will.i.am

• Glamour Women Of the Year Awards 2012

  Holly Willoughby

• Glamour Women Of the Year Awards 2012

  Kylie Minogue

• Glamour Women Of the Year Awards 2012

  Tom Hiddleston

• Glamour Women Of the Year Awards 2012

  Eva Longoria and Cuba Gooding Jnr

• Glamour Women Of the Year Awards 2012

  Laura Whitmore

• Glamour Women Of the Year Awards 2012

  Sophia Vergara

• Glamour Women Of the Year Awards 2012

  Alex Jones

• Glamour Women Of the Year Awards 2012

  Katherine Jenkins

• Glamour Women Of the Year Awards 2012

  Lily Allen

• Glamour Women Of the Year Awards 2012

  Allegra and Donatella Versace

• Glamour Women Of the Year Awards 2012

  Yasmin Le Bon

• Glamour Women Of the Year Awards 2012

  Alexandra Burke

• Glamour Women Of the Year Awards 2012

  Amanda Holden

• Glamour Women Of the Year Awards 2012

  Tess Daly

• Glamour Women Of the Year Awards 2012

  Myleene Klass

• Glamour Women Of the Year Awards 2012

  Rizzle Kicks

• Glamour Women Of the Year Awards 2012

  Jessica Alba

• Glamour Women Of the Year Awards 2012

  Natalia Vodianova

• Glamour Women Of the Year Awards 2012

  David Furnish and Naomi Watts

• Glamour Women Of the Year Awards 2012

  Alesha Dixon

• Glamour Women Of the Year Awards 2012

  Kelly Brook

• Glamour Women Of the Year Awards 2012

  Naomi Watts

• Glamour Women Of the Year Awards 2012

  Little Mix

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