" She didn't leave fans speculating for too long though, and posted another image today, which left them in no doubt of her happy baby news.
Alongside a sketch of a heavily pregnant woman are the words, "God Bless Mother Nature" (a line from Halliwell's single "It's Raining Men") with the hashtag #mamaspice.
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In July, Halliwell and fellow Spice Girls Mel B and Emma Bunton announced that they planned to reunite without Mel C or Victoria Beckham under the name GEM.
The threesome have allegedly confirmed a comeback gig at London's Hyde Park in July 2017 to celebrate 21 years of the Spice Girls, but who knows how Halliwell's announcement could affect their plans?
The co-educational secondary school, which is expected to be built near her north London home, will specialise in the arts and business.
Mrs Horner, whose daughter Bluebell was born in 2006, is determined to help teenagers fulfil their potential.
For something old, Halliwell opted to wear a pair of vintage drop pearl earrings, and for something new, the Brit revealed that she was going to walk down the aisle in a stunning couture lace gown. Well, the bride donned a stunning diamond necklace and a teeny tiny blue bow, respectively.
Meanwhile, Christian also has a daughter, Olivia, from his previous relationship.
This marks the first marriage for Halliwell, who has a daughter, Bluebell, from a previous relationship.
Former Spice Girlsstar Geri Halliwell has tied the knot with her longtime beau Christian Horner in a stunning ceremony surrounded by tons of family and friends in Bedfordshire in England. Horner OBE and Geri Halliwell, The engagement is announced between Christian, son of Mr and Mrs G.
The redhead crooner donned a fit-for-a-princess gown and waved to the crowds of fans before entering Woburn Abbey with her Formula 1 racing team boss love.