05/25/2012 15:25

By Gina Serpe

No further details about the engagement, including when or how the proposal took place, or a possible wedding date, have been revealed.

It'll be the first time down the aisle for both stars. Knightley previously dated actor Rupert Friend for five years before splitting in early 2011, and model Jamie Dornan, whom she dated for two years before that.

Congrats, you two!