LONDON: British actress Keira Knightley is to marry the singer with rock band the Klaxons, James Righton, the couple announced Friday.

The 27-year-old “Pirates of the Caribbean” star has been dating Righton, who also plays keyboards in the band, since early last year.

“I can confirm that Keira is engaged to be married to James Righton,”Knightley's spokeswoman said, declining to give any further details.

Knightley, who was nominated for an Oscar in 2006 for her performance in “Pride and Prejudice”, had previously dated her co-star in the film Rupert Friend for several years.

She and Righton, who is currently working on a third album with the Klaxons, have kept a low profile during their 15-month romance, rarely attending celebrity events together.