Alexandra Burke can’t remember her life before she had kids. The 35-year-old singer – who has two young children with her footballer partner Darren Randolph – has achieved a great deal in her professional life since competing on ‘The X Factor’ 16 years ago but she admitted it all pales in comparison to her achievement of building her own family with Darren. She told heat magazine: “Since having children, I’m enjoying everything 10 times more. I enjoy family time with the kids and Darren. I can’t remember my life without them – it’s unbelievable. I feel very lucky to have given birth to two ama…