JK Rowling and Tony Blair are starring in a special episode of The Simpsons in the States on Sunday.
The Harry Potter author and the Prime Minister appear in the show when Homer comes to London.
Homer apparently makes his mark in England when he crashes a Mini through the gates of Buckingham Palace.
Mr Blair and JK are said to have recorded their real voices for the episode, which will be shown in the UK in January 2004.
Loads of other celebs have appeared in the popular cartoon.
Homer causes more havoc in the episode by spilling tea on the carpet at the Prime Minister's home, and by getting locked up in the Tower of London.
Britney Spears, U2 and Sir Paul McCartney have all gone animated to appear in the show.