Keira Knightley engaged to James Righton from Klaxons

The actress previously dated actor Rupert Friend for several years

Actress Keira Knightley and her boyfriend, James Righton, from Klaxons have announced their engagement.

A spokeswoman for the actress said: "I can confirm that Keira is engaged to be married to James Righton."

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

James Righton (left), Jamie Reynolds (centre) and Simon Taylor-Davis

The couple have been together for 15 months and were introduced by their TV presenter friend Alexa Chung.

The 27-year-old actress, whose past movie roles include Atonement and the first three Pirates Of The Caribbean titles, is due to begin filming in the US.

She will star as a wannabe singer in Can A Song Save Your Life?

The Oscar-nominated actress previously dated Pride and Prejudice actor Rupert Friend for several years. The couple split in 2010.

Her new fiance, keyboardist James Righton, is working on a new album with his band after releasing their second record in 2010.

The Klaxons' debut album Myths Of The Near Future won the Mercury Prize in 2007.