The White House has confused the spelling of British PM Theresa May's name with that of porn actress Teresa May in media guidance notes ahead of her audience with Donald Trump.

The British PM met Donald Trump on Friday - the new US president's first meeting with a foreign head of state.

The White House's daily guidance and press schedule from the office of the press secretary reads: "In the afternoon, the president will partake in a bilateral meeting with United Kingdom Prime Minister, Teresa May" - missing out the "h" in her name, despite spelling it correctly elsewhere.

It continued: "The president participates in a working luncheon with Teresa May, Prime Minister of United Kingdom."

Teresa May - without the "h" - is in fact a soft porn actress and glamour model who also starred in a video for the song Smack My Bitch Up, by dance music band The Prodigy.

The error was repeated in a later guidance note from the Office of the Vice President, though it elsewhere also spelled her name correctly, before finally being rectified fully in another notice from the same office.