She added: “Girl power will always be out there and is something that we all still believe.
“What I do now is still all about girl power, but it’s empowering women through power.”
Beckham and Melanie C had reportedly been the reasons why the group did not mark their 20th anniversary last year.
Instead, Mel B, Emma Bunton and Geri Horner – nee Halliwell – posted a special video without them to celebrate the occasion.
A source had told The Sun two weeks ago: “Things between [the whole band] were quite icy at the start of the year.

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“But gradually the ice thawed, and Mel was the one who drove that. Mel’s divorce battle also helped to bring them back together, as did the birth of Geri’s son.
The band previously reformed in 2007, and again for the Olympics in 2012.