Scary Spice herself was on hand to introduce a special Rooftop Cinema Club screening of Spice World in Los Angeles on Wednesday and gushed about how the four other members of the girl group are still her "best friends" -- but she wasn't letting Posh get away with saying her mic was cut so the other girls could sing.
"She wishes it was turned off!" Mel B told ET's Lauren Zima. "We sung live, and we wrote and recorded all our music together live and we performed it live. It wasn't turned down. Not that I know of. Maybe she secretly asked for that -- I don't know about that."
The 41-year-old singer revealed it had been years since she'd watched the 1997 cult classic, but said she only has fond memories of shooting the film with Beckham, Emma Bunton, Mel C and Geri Halliwell.
"I think just doing 12-hour days and going delirious with each other!" she recalled to ET her favorite memory from shooting the film. "We just had a lot of fun! You know, you've got five young girls that are together and just living their dream and doing whatever we want to do, saying what we want to say, wearing what we want to wear!"
As for that last bit, Mel says she still owns all of her iconic Spice Girls costumes.
"I have everything! Because we kind of made up our own costumes as we went along," she explained. "The more money we got, the more tailor-made our clothes got, but we actually were bargain hunters and I still am to this day.
"I think I have probably 80 percent of all my outfits," she went on. "Because when we used to get our outfits made, I used to get like two or three different copies and colors because I was obsessed with my style back then!"
While Mel -- who previously said it "would be rude" not to celebrate the Spice Girls' 20th anniversary this year -- played coy on the possibility of new music, she did confirm there are "ongoing" talks about a reunion tour though.
"It's an ongoing thing we keep talking about, and it is our 20th anniversary, so we're going to do something," she confirmed. "We're just trying to figure that out right now. There will be something happening."
Just don't expect it to be a joint tour with the Backstreet Boys, as has been rumored.
"We want the stage to ourselves if we're going to do it!" Mel exclaimed. "But, I love the Backstreet Boys. They're great."
While Beckham was hitting the red carpets at Cannes, the "Wannabe" band recently had a mini reunion in London. Check out all the photos of the Spice Girls reunited in the video below!