In the snap, the future singer can be seen in her bedroom, sticking her tongue out as she sat in her pajamas in front of a wall covered in posters of the girl band.
"Liar liar, trousers on fire!" remarked Melanie Brown on Heart FM when it was mentioned that their reunion tour would run to just the six stadium gigs.
"She obviously was and still is a huge part of the band", Mel C told bandmate Emma Bunton, who co-presents the station's breakfast show with Jamie Theakston. Even if she's got a busy life, three children, a business, she always remembers to say good luck.
Horner said: "I love her honesty".
Geri, also known as Ginger Spice, was snapped leaving the BBC Radio 2 studios with her fellow bandmates, and we got major Victoria Beckham vibes in her all-white look. The "When We Were Young" hitmaker shared a picture of her much-younger self, smiling broadly while surrounded by Spice Girls posters.
"There were times I wasn't sure about doing it", she admitted.
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"This is not my job, this is my life and my girls".
And Brown used the opportunity to poke fun at Horner and Evans after they dated in the late 1990s.
"Can I just rectify something?" While she's "very excited" now, it sounded like she and the other "girls" respect Beckham's decision to sit this one out.
The five-piece group formed in 1994, split in 2000, but reunited for a world tour in 2007.
There were jokes about Mel B "behaving herself" as they prepare for their Spice World shows next year - their first shows since the London Olympics closing ceremony in 2012, and their first tour since their last reunion 10 years ago.