The statement (shared with Entertainment Weekly) claims that the women "enjoyed a wonderful afternoon catching up and reminiscing about the unbelievable times", which was visible in the Instagram photos.
Beckham joined Geri Horner, Emma Bunton, Melanie Brown and Melanie Chisholm at Horner's Hertfordshire home for the meeting, which they later gave fans a sneak peek of with pictures across their social media accounts.
Sporty Spice, 44, said "we need the girl power message more now than ever", suggesting that the band members had their famous legacy on their mind in addition to a £10 million paycheck when they made a decision to reform.
The band - famous for singles such as Wannabe and Who Do You Think You Are - have sold over 85 million records worldwide, one of the best-selling pop groups of all time.
Taking to Twitter, Posh Spice aka Victoria Beckham said she was excited at the prospect of a reunion although the group will neither tour nor release a new album.
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Following their reunion along with manager Simon Fuller, the Spice Girls said in a statement: "We have enjoyed a wonderful afternoon catching-up and reminiscing about the incredible times we have spent together".
"Young girls are rediscovering the Spice Girls and it just feels like a really positive time, we need the girl power message more now than ever". They split in 2000 and last reunited at the 2012 London Olympics.
According to one report this reunion might produce another greatest hits compilation, a TV show (possibly in China) and a number of deals with major brands ... but no new music, and perhaps not even any concerts.
In 2014, Horner, Bunton and Brown teased a 20th anniversary project under the moniker GEM (Geri, Emma, Melanie) but that endeavour was ultimately nixed after Horner became pregnant.