Mel B's sister Danielle was "so proud" of her performance at the Olympic closing ceremony.
Mel - who is estranged from her younger sibling - was joined by her Spice Girls bandmates Victoria Beckham, Geri Halliwell, Mel C and Emma Bunton on stage at the event earlier this month, and she admits she "cried" when she saw it.
She said: "I've watched it about 100 times. I'm just so proud of her for doing that. It's amazing they can all get together years down the line and create that magic.
"I thought Mel looked gorgeous. I would've preferred her hair a lot bigger, mind. I'd love them to do a one-off gig in Vegas. I was crying while I was watching it. We were always so close."
Danielle claims she has tried to stay in touch with her sister, but Mel's husband, Stephen Belafonte, has banned them.
She added: "I've never had a bad word to say about her. I just wish I had a reason why we've been cut off.
"My mum and dad have had their grandchildren ripped from them. Stephen told my mum, 'You'll never ever see your grandchildren again.' He's clearly a man of his word."