[2] In 2001, Pietersen auditioned for the ITV reality television music competition Popstars, a show intended to form a new group from individual contestants, becoming one of the finalist.
While the five winning contestants formed Hear'Say, the five runner-up contestants – Young, Tony Lundon, Kevin Simm, Kelli Young and Michelle Heaton – formed the group Liberty X and signed a multimillion-pound record contract with Richard Branson and V2 Records.
[3] In 2013 Pietersen reunited with Liberty X for ITV2's reality show The Big Reunion, along with other pop groups of their time – B*Witched, Honeyz, 911, Five and Atomic Kitten – to solve past problems and do a live performance at the London Hammersmith Apollo on 26 February.
[7] In 2017, Pietersen, Kelli Young and Michelle Heaton reformed Liberty X again, but as a three-piece girl group, without Tony and Kevin.
[9][10] On 29 December 2007, she married England cricketer Kevin Pietersen at a service in Castle Combe.