Married at First Sight Australia’s Martha Kalifatidis has just unveiled a brand new hair colour after receiving nasty social media comments about the burnt copper shade she’d been favouring since appearing on the explosive reality show.The 32-year-old showed off her glossy tresses on Instagram, giving followers a closer look at her new jet black hair colour. She also chose to show off her new hue in the nude, as Martha appears completely topless in the trio of glamorous snaps.