Melanie Chisholm is set to marry her long-time boyfriend Thomas Starr after he proposed ahead of the birth their first child.The former Spice Girl and her partner of six years are expecting a baby together in the new year - thought to be around March - and the couple is reportedly planning to exchange nuptials shortly after the tot arrives.According to Britain's Daily Mirror newspaper, the parents-to-be got engaged last month and are aiming for a spring wedding. hisholm will be the last of the Spice Girls to become a mother - Melanie Brown has two daughters; Posh Spice Victoria Beckham has three sons with soccer ace David Beckham, and Geri Halliwell and Emma Bunton each have one child.