Members of the royal family have attended the parade by 1st Battalion Irish Guards for more than 100 years

Catherine, Duchess of Cambridge, may be used to being called a "knockout," but people don't usually mean it in the literal sense.

This morning, the British beauty's dark-green ensemble for St. Patrick's Day took its toll on one Royal Guard member, who fell backward, as if punched by an invisible Lennox Lewis.

"Kate Middleton is so pretty a solider fainted," tweeted @CRM_Stephen, whose spelling lapse might also be triggered by Kate-exposure.

The Daily Mail has photos of the full St. Paddy's Day festivities, including shots of Kate meeting with the Irish Guard, pinning a clover on a dog and sipping sherry.

Bowled over: The event was too overwhelming for one young guardsman who passed out in his formal uniform during the Irish Guards' parade

Bowled over: The event was too overwhelming for one young guardsman who passed out in his formal uniform during the Irish Guards' parade

 

Could someone be attractive enough to knock you out?