Alexandra Burke is determined to “work harder” since becoming a parent. The 36-year-old star has two children – a two year old and a 13 month old whose names she has not publicly revealed – with her footballer fiance Darren Randolph and says that motherhood has enhanced her music and acting ambitions. Alexandra, who has made her screen acting debut in the Paramount+ crime drama ‘Curfew’, told OK! magazine: “Being a mum has made me want to work harder. “There’s so much more I’d love to do – especially in acting. I’ve got the bug for it now.” The ‘X Factor’ winner’s music career has taken a back…