The Liverpool-born singer has confessed she was completely overwhelmed to be on stage with bandmates Victoria Beckham, Emma Bunton, Mel B and Geri Halliwell again at last week's Victoria's Secret Fashion Show.
Mel - who last performed with all four girls nine years ago - said: "It was well scary! The crowd were cheering so loudly when we came on stage that I really had to try and hold back the tears.
"My legs went all stiff at one point too, and if I hadn't been standing next to Emma, I would have fallen over - not a good look!"
Despite her emotional first night, the singer - also known as Sporty Spice - insists she is incredibly excited about their upcoming world tour, which starts on December 2 in Vancouver, Canada.
Mel added: "Things are getting really exciting now as we get closer to the first concert. We've started running the show and after this tour I reckon we'll all be fit enough to run a marathon. It's hardcore, even for Sporty Spice!"