Kimberley Walsh says birthdays will never be the same after losing her 'birthday twin' Sarah Harding

Kimberley Walsh watches videos of Sarah Harding performing to release her grief

Kimberley Walsh says 'it's physically impossible' to get waistline back and her sons tease her over 'big bum'

Kimberley Walsh feels she is 'a breath away from messing up' as a mum