Keira Knightley To Marry Rock Star Boyfriend

Hollywood star Keira Knightley is to marry her rock star boyfriend, James Righton from Klaxons.

It has been confirmed that the couple, who have been together for 15 months, are now engaged.

Oscar-nominated Knightley, 27, previously dated actor Rupert Friend for several years.

She and Righton are said to have been introduced by their TV presenter friend Alexa Chung.

Keyboardist Righton won the Mercury Prize in 2007 with his band's debut album Myths Of The Near Future.

Knightley's spokesman said: "I can confirm that Keira is engaged to be married to James Righton."

The details of the proposal are being kept under wraps. Her publicist added: "We are not discussing any further details."

Knightley, whose movie roles have included Atonement and the first three Pirates Of The Caribbean titles, is soon due to begin work on her next film in the US.

The 27-year-old will star as a wannabe singer in Can A Song Save Your Life?.

The couple have kept their romance low-key, rarely attending celebrity events together, but they have been spotted together casually on a number of occasions.

Klaxons are working on a new album after releasing their second in 2010.