The Scottish singer - dubbed "The Hairy Angel" won the public vote as an estimated 14 million viewers watched her show-stopping version of Andrew Lloyd Webber's Cats song Memory.
She earned a standing ovation from both the judges and the audience for her pitch-perfect rendition.
Judge Amanda Holden said she was biting all her acrylic nails off as Susan came to perform, adding: "You are turning in Eva Peron. I am just so relieved that it went so well for you."
Fellow judge Piers Morgan said: "I think you look beautiful tonight. And more importantly, you sang beautifully as well."
While Simon Cowell APOLOGISED to Susan. He said: I just want to apologise because the way we treated you before you first sang... you made me and everyone else look stupid."
Essex dancers Diversity join Susan in the final - after judges voted to put them through instead of 10-year-old Natalie Okri.
Also missing out on a place in the finals was "vixen violinist" Sue Son, dancer Darth Jackson, belly dancer Julia Naidenko, driller Nick Hell and Comedy duo Faces of Disco.
Tonight's semi finalists competing on ITV 1 between 9 and 10.30pm for the next two places in the final are:
Drag Queen Mama Trish (aka Peter Coghlan)
Singer Jamie Pugh
Diving helmet contortionist Merlin
Ventriloquist Gareth Oliver
Dance group Flawless
Singer Shaun Smith
Rapper DJ Talent
Dance group Hot Honeyz
Last year's finalists Escala will also be in the studio.
This article has 2 comments
i was in support of susan boyle.
i admire her for her strength that she had to pull up during this what should have been excitng and wonderful moment in her life. i am stunned she did not win .
although i do believe that diversity was extremely talented but there is no comparison in my opinion susan boyle is the real thing. I hope to see her lots more.
thanks for your time and i also must say i appriciate simon and the rest of the gang for reminding the world sometime we underestimate people and they may very well be fabulous and unique such as susan boyle .
By Ty. Posted June 5 2009 at 12:20 AM.
susan should be the winner she is fantastic she beets all ther rest easily.
By anthony crockett. Posted May 27 2009 at 9:50 AM.