The show kicked off with Baby, Scary, Ginger and Sporty taking to the stage in extravagant fashion for their first number, wearing hand-embellished Swarovski crystal costumes designed by Gabriella Slade.
She said: "In '98, we started our world tour in Dublin, so we truly are home".
Well, apparently, some people were left upset with the return of the Spice Girls.
At one point, Horner told the crowd: "We're four grown women dressed as a superhero, a princess, a queen, and a leopard - I hope you all get a good laugh out of it because it's all for you".
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I love you all so much, more than ever!
They opened the show with the message: "We welcome all ages, all races, all gender identities, all countries of origin, all sexual orientations, all religions and beliefs, all abilities". Thank you to our wonderful fans, without you we never could have done this, we are eternally grateful for your endless support.
The 13-date tour is the latest reunion for one of the world's biggest girl bands which sold tens of millions of records, and is known for hits like "Say You'll Be There", "2 Become 1" and "Spice Up Your Life".
Worst gig ever - The Spice Girls return * They're back, minus Posh: Spice Girls to tour United Kingdom next summer * Were we wrong about Victoria Beckham this whole time? "It's got a very special place in our hearts".
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The last time the group performed as a five some was at the London Olympics in 2012.
But on the opening night, there did not appear to be any tension between them.
"There's something wrong when the crowd at the Spice Girls concert are all sitting down because no one has a clue what song is on because the sound really is that bad", Sabrina Egerton tweeted.
The Spice Girls will now head to Cardiff, then Manchester, Coventry, Sunderland, Edinburgh and Bristol.
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