Louis Tomlinson to Join Simon Cowell on X Factor to help mentor contestants.

The former X Factor contestant will return to help Judge Simon Cowell.

X Factor judges houses 2015: Louis Tomlinson joins Simon Cowell to choose his final three contestants, London Evening Standard

Louis Tomlinson hints at quitting The X Factor ahead of celebrity series

Simon Cowell and Louis Tomlinson moments the X factor UK part 1

Louis Tomlinson Got Help From Simon Cowell During a Pretty Scary Moment, Louis Tomlinson, One Direction, Simon Cowell

Simon Cowell opens up about co-judge Louis Tomlinson's future on The X Factor

The X Factor 2015: Louis Tomlinson for Simon Cowell's judges' houses, TV & Radio, Showbiz & TV

X Factor returns with 'most bizarre thing' Louis Tomlinson has seen on the show

The X Factor 2014: One Direction's Louis Tomlinson mentors contestants - OK! Magazine

Louis Tomlinson signs new solo deal with mentor Simon Cowell

Simon Cowell 'signs up One Direction's Louis Tomlinson as X Factor mentor

Louis Tomlinson 'threatens to quit X Factor' over Simon Cowell's all-stars shake-up - Mirror Online