Judges }
The X Factor debuted in 2005 with Australian recording artist
Kate Ceberano, record producer
Mark Holden, and Scottish events manager
John Reid as the judges. Ceberano's judging skills were compared to
X Factor UK judge,
Sharon Osbourne. When it was announced that
The X Factor would return in 2010, British reality television star
Peter Andre was linked to the role. However, he declined the offer as he did not want to be away from his children for so long. The judging line up was announced in May 2010 with Irish recording artist
Ronan Keating, radio presenter
Kyle Sandilands, and Australian recording artists
Guy Sebastian and
Natalie Imbruglia. On 16 March 2011, Sandilands announced that he would not be returning for season 3, stating that he left the show because "it's just too hectic, it's too much work". On 27 April 2011, the
Seven Network confirmed that
Mel B would be Sandilands' replacement, and
Natalie Bassingthwaighte was confirmed as Imbruglia's replacement on 6 May 2011. Bassingthwaighte said she would focus on bringing an honest critique to the show and will guide "the artists through the competition", while Mel B said, "[The contestants] are either going to love me or hate me but it's going to be a fun ride. I'm really easy to get on with and I'm a hard worker. I'm firm but nice." Keating, Sebastian, Bassingthwaighte and Mel B returned for the fourth season in 2012. In March 2013, Keating confirmed in an interview with
News Limited that Sebastian and Mel B had left the show, but stated that he wanted them to return.
Dannii Minogue was announced as Mel B's replacement on 12 April 2013, and
Redfoo was announced as Sebastian's replacement on 21 April 2013. Minogue, Redfoo, Bassingthwaigte and Keating returned for season 6 in 2014. In April 2015, Keating and Bassingthwaighte announced that they would not be returning for the
season 7 in 2015. Redfoo also announced his departure the following month. On 3 May 2015, it was announced that Sebastian would be returning to the panel along with two new judges
James Blunt and
Chris Isaak. Minogue was the only judge from the previous season who returned. On 12 June 2016,
Iggy Azalea was announced as a new judge for the series. On 20 June 2016,
Guy Sebastian was confirmed to be returning as a judge. The following day,
Adam Lambert was announced as the third judge for season 8. In October 2016, it was confirmed that former judge Mel B would be joining the show as the fourth and final judge for season 8, as "The Underdog Judge". File:Kate Ceberano at the 2011 Logie Awards.jpg|
Kate Ceberano (2005) File:Natalie Imbruglia Cannes.jpg|
Natalie Imbruglia (2010) File:Ronan Keating - 2016330211548 2016-11-25 Night of the Proms - Sven - 1D X II - 0567 - AK8I4903 mod.jpg|
Ronan Keating (2010–2014) File:Kyle Sandilands 2014.jpg|
Kyle Sandilands (2010) File:Guy Sebastian ESC2015 Eurovision Village Vienna 08crop2.jpg|
Guy Sebastian (2010–2012, 2015–2016) File:Natalie Bassingthwaighte 4, 2012.jpg|
Natalie Bassingthwaighte (2011–2014) File:Mel_B_(32151327546)_(cropped1).jpg|
Mel B (2011–2012, 2016) File:Dannii Minogue arrives at the 58th Annual Logie Awards at Crown Palladium (26904220225) cropped.jpg|
Dannii Minogue (2013–2015) File:Redfoo Sydney 2014.jpg|
Redfoo (2013–2014) File:James-Blunt2.jpg|
James Blunt (2015) File:Chris-isaak.jpg|
Chris Isaak (2015) File:Iggy Azalea August 2015.jpg|
Iggy Azalea (2016) File:Queen + Adam Lambert 4 (15659934964).jpg|
Adam Lambert (2016)
Hosts and other personnel When
The X Factor began in 2005,
Daniel MacPherson was the main host of the show and
Chloe Maxwell was the host of the spin-off show,
The Xtra Factor. Following the announcement that
The X Factor was returning in 2010, the
Herald Sun reported that MacPherson was favourite to fill the hosting role but was unable to commit because of his duties on
Dancing with the Stars. On 30 May 2010, actor
Matthew Newton was announced as the host. However, on 22 August 2010, it was revealed that Newton had to withdraw after an altercation in
Rome with his now ex-girlfriend
Rachael Taylor. Newton flew from Rome to
Dublin, where he was to film segments for
The X Factor with Keating. However, he was escorted back to Australia by a producer of the show after they decided he was in no state to film. He was then checked into
Wentworthville's Northside West Clinic. On 23 August 2010, it was announced that actor
Luke Jacobz would take over as host and all original audition footage with Newton was removed with footage of Jacobz being shot instead. On 28 August 2010, it was announced that radio presenter
Natalie Garonzi would host
The Xtra Factor on
7Two. Season three finalist Johnny Ruffo joined the fourth season live shows as the host of the online
live streaming show,
The X Stream. On 25 June 2016, Jason Dundas was announced as Jacobz's replacement. File:Daniel MacPherson.jpg|
Daniel MacPherson (2005) File:Luke Jacobz X Factor.jpg|
Luke Jacobz (2010–2015) File:Jason Dundas 2015 (cropped).jpg|
Jason Dundas (2016)
Judges' categories and their contestants In each season, each judge is allocated a category to mentor and chooses a small number of acts (three acts) to progress to the live finals. This table shows, for each season, which category each judge was allocated and which acts he or she put through to the live finals. : – Winning judge/category. Winners are in bold, eliminated contestants in small font. ==Reception==