Simon's unique experience shepherding bands such as One Direction makes him the ideal mentor.
Despite not wanting to mentor the Over 25s at first, LA is ready for the challenge.
Britney is the perfect choice to mentor the teens because she's been in their shoes.
Are Demi LovatofpvAPOSs alarming eyebrows overshadowing the competition?
Demi's group is thrilled to have her as their mentor.
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