Prince William and Kate Middleton will celebrate St Patrick's Day with the Irish Guards.

The couple wished their followers a happy St Patrick's Day on Twitter.

They will join the Irish Guards for the St Patrick's Day parade.

Kate Middleton will take the salute as Colonel of the Irish Guards.

It will be her first time taking the salute for the Irish Guards.

Prince William will watch from the wings.

The event is historic for the couple.

Earlier reports suggested Kate was preparing for a special event.

Their Twitter message suggests they're looking forward to the celebration.