Donald Trump's twitter can be amusing at the best of times, but he has excelled himself on this occasion. 

Tweeting about his recent meeting with the Queen, Prince Charles and Theresa May, Trump hilariously referred to the Prince Charles as the 'Prince of Whales'. 

Who is this mystery 'Prince of Whales'? Some say it is Moby-Dick, others 'Willy' - the orca whale from cult film Free Willy. 

Trump has since removed the post and replaced it with the correct spelling, but not before people - ourselves included - took a screen shot of the precious tweet. 

The Leader: Donald Trump's hilarious gaff on TwitterDonald Trump's hilarious gaff on Twitter