Judge's pearl of wisdom: "This is a British competition and you make me very proud to be British. You've really got to me" - Simon Cowell.
Superstar advice: "I think Alexandra can belt her voice too much. I noticed she was getting a bit raspy. She really needs to have lots of lessons and make sure she doesn't lose that voice" - Will Young.
Alexandra has sung songs by divas like Christina Aguilera and Donna Summer
Has she ever been in the bottom two: No.
Trivia: Alexandra nearly made it through to the competitive stages of X Factor in 2005, but Louis Walsh turned her down, saying she was too young.
Tabloid "scandal": Ex-boyfriend D'Andre West is trying to sell a "graphic 10-minute video" which will "shatter beautiful Alex's dreams of superstardom". [News Of The World]
Favourite X Factor moment: Meeting Take That - "When I was younger I was such a big fan! I had Take That pillow cases, Take That bed sheets, Take That wallpaper - everything!"
On the final: "Whatever way the voting goes on Saturday night, I'm going to leave with my head held high knowing: 'Oh my God, I've actually made it to the finals' and that's an achievement in itself."
Bookmakers' odds: 8/13
JLS
Singer Marvin Humes was in boyband VS, who toured with Blue
Members: Marvin Humes, 23; Jonathan "JB" Gill, 21; Ortise Williams, 21; Aston Merrygold, 20.
Location: London and Peterborough.
Category: Groups.
Mentor: Louis Walsh.
Audition song: If You Ever - Shai, made famous by East 17 and Gabrielle.
Recognisable feature: Each member has a "signature colour". Marvin is green; JB is yellow; Ortise is red; Aston is blue.
Which successful act are they most like: 3T, the briefly-successful 1990s boyband formed by Michael Jackson's nephews.
Judge's pearl of wisdom: "It's official: I am in the JLS fan club. I will join tomorrow" - Cheryl Cole.
Superstar advice: "You must always keep the friendship. That's the bond with us, and that's what's kept us together... And you've got to work your butts off" - Howard Donald from Take That.
The band have covered Frankie Vali, The Beatles and Take That
Have they ever been in the bottom two: Yes, against Rachel Hylton in week seven.
Trivia: JLS is also the brand name of a Chinese gas bolt action sniper rifle.
Tabloid "scandal": Louis Walsh has ordered JLS to hit on the female competitors to put them off. "He told us to do our worst," said lead singer Aston. [Daily Star]
Favourite X Factor moment: When Ortise got the chance to tell Mariah Carey he'd had a crush on her since he "was a little kid". The diva said she "thought it was cute".
On the final: "It's the biggest moment of our lives. We would like to, hopefully, make X Factor history and be the first group to ever win the show" - Ortise.
Bookmakers' odds: 5/2
EOGHAN QUIGG
Eoghan discovered his voice while singing in the school choir.
Age: 16.
Location: Dungiven, Northern Ireland.
Category: Boys 14-24.
Mentor: Simon Cowell.
Audition song: Home - Michael Buble.
Recognisable feature: Surplus hair.
Which successful act is he most like: Little Jimmy Osmond.
Judge's pearl of wisdom: "Eoghan Quigg - the Quiggler! To me, you're like FedEx. You always deliver" - Louis Walsh.
Superstar thoughts: "You have such a pretty voice on the high breathy stuff. That's your gem" - Mariah Carey.
The teenager's songs have included Never Forget and Year 3000
Has he ever been in the bottom two: No.
Trivia: Eoghan's name is worth 26 points in Scrabble, and uses up all three "g" tiles.
Tabloid "scandal": Eoghan is dating fellow X Factor contestant Diana Vickers and, at the same tame, "cosying up to Kate Moss" (borrowing her coat). [The Sun]
Favourite X Factor moment: The moment when, after he performed Take That's Never Forget, Cheryl Cole said: "I think I'm a little bit in love with you after that performance".
On the final: "I'm not nervous for the final, singing-wise, but the results are always going to be nervous. All three acts want to win. And who know what's going to happen."
Bookmakers' odds: 4/1
The X Factor Final is on ITV1 this Saturday at 1910 GMT.
The X Factor Final Results Show follows on ITV1 at 2140 GMT.
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