The Duke of Cambridge visited his pregnant wife at the King Edward VII Hospital after the Duchess spent the night under observation.
Having announced they are expecting their first child, Kate is being treated for a severe type of morning sickness.
The Duke was snapped making a speedy entrance into the hospital, wearing a blue jumper and jeans.
But he was not the only William to try to visit the Duchess as a man wearing a Prince William mask made to walk into the hospital.
Despite his ‘convincing’ disguise, the man was led away by police.