Kate Middleton uses a "power play" move to keep Prince William in check, according to a body language expert.

The Prince and Princess of Wales celebrated St Patrick's Day with the Irish Guard on March 17.

A body language specialist said Kate took her new duty as Colonel of the army seriously from William.

Kate used a "cold, hard stare" directed at her husband to show off her authority during the event.

Betfair Bingo's Darren Stanton claimed Kate's dress was meant to show "power" in her new role.

The future King said he was "very unhappy" to hand over the Colonelship to his bride.

Kate and William reportedly spat over Prince George's involvement in King Charles' coronation later this year.

Royal analyst Tom Quinn suggested a "bit of a dispute" over Prince George's participation at the elaborate ceremony.

Kate and William are reportedly worried about the pressure it could place on the nine-year-old.