They came. They saw. And they caused total pandemonium! For this list, WatchMojo UK counts down the craziest examples of British celebs appearing on US talk shows. Whether it's Helen Mirren smooching Stephen Colbert, Gordon Ramsay fighting fires with James Corden, Daniel Radcliffe rapping the alphabet or Borat vs Letterman... these are some of the most iconic moments in American TV history.

Check out these other brilliantly British videos from WMUK:
Top 10 British Characters Played by Non-British Actors -    • Top 10 British Characters Played By N...  
Top 10 British Celebs Who Got Kicked Out of School -    • Top 10 British Celebs Who Got Kicked ...  

Check out “The Late Show with Stephen Colbert” here!
   / @colbertlateshow  

Check out “The Late, Late Show with James Corden” here!
   / thelatelateshow  

Check out “Conan” here!
   / teamcoco  

Check out “The Tonight Show Starring Jimmy Fallon” here!
   / latenight  

Check out “Late Night with Seth Meyers” here!
   / latenightseth  

Check out “Morning Joe” here!
   / @msnbc  

#JamesCorden #Conan #LateNight #JimmyFallon