The five girls - Mel, Geri Halliwell, Victoria Beckham, Mel B and Emma Bunton - reunited to appear at the London 2012 Olympics closing ceremony and although it was perceived to be a one-off, the 38-year-old singer isn't so sure.
She said: ''It was amazing. We always think, 'That's it, we'll never do anything together again.' But 'never say never' is one of our mottos!''
Mel is still shocked that people are still interested in the group 16 years after they released their debut single 'Wannabe'.
She mused: ''People are still intrigued by us but, at the end of the day, we're just five normal girls - even Victoria!''
Mel - who has just released her sixth solo album 'Stages' - loves seeing the girls and she considers the other four members her best friends.
She said: ''I love them dearly. We're older now and have a lot more respect for each other.
''We're also appreciative of each other because we know that, without one another, we wouldn't be where we are today.''