The Princess of Wales's pat on Prince William's bottom on the BAFTA red carpet may actually have been a reprimand for him, according to a body language expert.
The couple put on a glamourous display with Kate wowing in a recycled Alexander McQueen gown and dramatic black opera-style gloves.
As they walked the carpet, Kate was spotted in a blink and you'll miss it moment tapping William affectionately on his behind.
