Britney and Destiny's Child also losers
Younger stars didn't escape his gaze, with Britney Spears winning the unwanted prize of second worst dressed woman and all three of Destiny's Child finishing fourth.
Blackwell said Britney wore "belly-baring bombs" while the Destiny's Child girls were often seen wearing "off-pitch kitsch".
Julia Roberts is best dressed
Movie star Julia Roberts will be much happier with her rating, with Blackwell deciding she was the best-dressed celebrity, ahead of US talk show host Oprah Winfrey.
It is the 42nd year in a row that Blackwell has announced his list of the best and worst dressed stars in the world.