By Katie Wilson Mel B had fans in stitches with her brutally honest review of the food on today’s episode of Saturday Kitchen. The 48-year-old was the celebrity guest on the BBC show hosted by chef Matt Tebbutt. Though things started off nicely, with Matt telling Mel his favourite Spice Girls song was Mama, it all went downhill when Matt started cooking for Mel – who it’s fair to say didn’t mince her words at his choice of dishes. Host Matt and his other guests in the studio struggled to keep a straight face as Mel turned her nose up at what she was served. Celebrities on the show are asked to…