The group – which also features Cheryl, Nadine Coyle, Nicola Roberts and Kimberley Walsh – split in 2013, just a year after they reunited for their ten year anniversary.
Sarah is 35 years old and was born on 17 November 1981 in Ascot, Berkshire.
As well as being known for her life on stage, Sarah has hit headlines on numerous occasions thanks to her troubled personal life.
In 2011 the star entered a rehab facility for depression, alcohol addiction and prescription drug abuse.
She was previously engaged to DJ Tom Crane but is currently believed to be single.
Previous boyfriends include music producer Mark Foster, Theo Van Dries and Danny Dyer – who The Sun recently revealed she had a six-week affair with.
After getting drunk in Week Two of CBB, Sarah and Chad Johnson and later that week the pair were seen kissing in bed.
This all happened despite Sarah having a boyfriend outside the house when she first entered the show.
The Sun revealed him to be Aaron Lacey - a plasterer from High Wycombe.
from : thesun.co.uk