X Factor: the final 24 who made it to judges' houses

Cheryl Fernandez-Versini is mentoring the groups in this year's X Factor.

Guest judge Jess Glynne will help Cheryl pick her final three acts.

4th Impact (formerly 4th Power)

- The band are Mylene (23), Irene (25), Almira (27) and Celina (19)

- The band are four sisters who have grown up singing and dancing together

- In their first audition, they performed Jessie J's Bang Bang

Alien Uncovered (formerly Alien)

- The band are Madison (19), Natalie (18), Temple (24), Frank (17), Yaz (23) and Shae (23)

- They have been together for 18 months

- In their first audition, they performed performed The Black Eyed Peas' Pump It

BEKLN Mile (formerly BEKLN)

- The band are Baison (31), Emmanuel (27), Kadeem (22), Lawrence (22) and Nathanael (29)

- They have been together for six months

- In their first audition, they performed James Bay's Hold Back The River

Melody Stone (formerly Silver Tone)

- The band are Keshia (32), Nicole (22), Rachel-Yvonne (31), Wynter (24) and Santhy (26)

- They have been together for six months

- In their first audition, they performed Simon and Garfunkel's Bridge Over Troubled Water

New Kings Order (formerly The First Kings)

- The band are Cardan (22), Aaron (25), Calum (23), Josh (21) and Hemz (25)

- The band have been together since April 2015

- In their first audition, the band performed Bruno Mars' Uptown Funk

Reggie n Bollie (formerly Menn on Point)

- The band are Reggie (31) and Bollie (29)

- The band have been together for three and a half years

- In their first audition, the band performed their own song, Turn It Up

Rita Ora will be mentoring the girls in this year's X Factor.

Meghan Trainor will be help Rita Ora choose her final six contestants.

Chloe Paige

- The 21-year-old hails from from Brighton

- Works part time on her dad's market stall selling cosmetics

- In her first audition, Chloe performed Katy B's Crying For A Reason

Havva Rebke

- The 21-year-old comes from Enfield

- Works in retail, in her cousin's clothes shop

- In her first audition, Havva performed Jessie J's Masterpiece

Keira Weathers

- The 18-year-old is from St Helens

- Works as a barmaid

- In her first audition, Keira performed Ella Eyre's We Don't Have To Take Our Clothes Off

Lauren Murray

- 26 years old, from North London

- Until recently, she worked as a dental receptionist

- In her first audition, Lauren performed Jocelyn Brown's Somebody Else's Guy

Louisa Johnson

- 17 years old, from Essex

- Currently a student

- In her first audition, Louisa performed Michael Jackson's Who's Loving You

Monica Michael

- 25 years old, from North London

- Singer/song writer and youth worker

- In her first audition, Monica performed Christina Aguilera's Impossible

Simon Cowell will be mentoring the overs category in this year's X Factor.

Simon Cowell's guest judge this year will be One Direction's Louis Tomlinson.

Anton Stephans

- 45 years old, from London

- Works as a singer

- In his first audition, he performed Jennifer Hudson's I Am Changing

Bupsi Brown

- 37 years old, from Leeds

- singer

- In her first audition, she performed Tina Turner's Rock Me Baby

Ebru Ellis

- 27 years old, from London

- Student and singer

- In her first audition, she performed David Guetta's What I Did For Love

Jennifer Phillips

- 49 years old, from London

- session singer

- In her first audition, she performed Mary Mary's Shackles

Kerrie-Anne Phillips

- 28 years old, from London

- works as a singer/teacher

- In her first audition, she performed Rihanna's We Found Love

Max Stone

- 27 years old, from London

- musician/song-writer

- In his first audition, he performed Bob Marley's No Woman No Cry

Nick Grimshaw will be mentoring the boys in this year's X Factor

Mark Ronson will be helping Nick choose his final three contestants.

Ben Clark

- 25 years old, from Coventry

- works as a night time receptionist

- In his first audition, he performed 3 Doors Down's Here Without You

Che Chesterman

- 19 years old, from Langdon

- Used to stack shelves but has been pursing life as a singer for past few months

- In his first audition, he performed Jessie J's Who You Are

Josh Daniel

-21 years old, from Billingham

- Works as a car mechanic

- In his first audition, he performed Labrinth's Jealous

Mason Noise

-22 years old, from Birmingham

- worked as a part-time waiter

- In his first audition, he performed Justin Timberlake's Señorita

Seann Miley Moore

- 24 years old

- Originally from Sydney, Australia but he moved to the UK to audition for The X Factor

- In his first audition, he performed Queen's The Show Must Go On

Simon Lynch

-22 years old, from Isle Of Man

- Worked in marketing

- In his first audition, he performed Beyonce's If I Were A Boy