Victoria also echoed his thoughts on her own Instagram page, writing: "Good luck to the girls today as they start their tour! x VB #SpiceGirls #FriendshipNeverEnds @EmmaLeeBunton @TheRealGeriHalliwell @OfficialMelB @MelanieCMusic".
While many fans took to Twitter to share their excitement about attending the concert, others were quick to share their disappointment as sound problems inside the stadium meant they were unable to hear the show, and one fan even claimed they saw "huge numbers" walking out of the show, reportsdailymail.co.uk.
"We have been fans for 20 years at least...but we have only been to see impersonators". The sound is very bad.
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.
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The Spice Girls shot to fame in 1996 with the single Wannabe and went on to have a series of global hits including Who Do You Think Are, 2 Become 1 and Viva Forever.
Geri has shared images of the set-up for the performance, which features an imposing Spice World sculpture and large screens on each side of the stage.
The Spice World Tour was announced last November, and will be the first time the group has performed since the closing ceremony of the London Olympics in 2012.
The source said that the remark created tension within the band, and even put the current tour in jeopardy, adding: "If they manage those United Kingdom dates then that will be the last you ever see of the Spice Girls".
The Spice Girls continue the tour in Cardiff on Monday night and will play Manchester, Coventry, Sunderland, Edinburgh and Bristol, before finishing with three show's at London's Wembley Stadium.