The fashion designer will make a public appearance with Emma Bunton, Mel C, Mel B and Geri Halliwell in the West End tomorrow (June 26) for the first time since their reunion tour in 2008, according to The Sun.
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"There's been rumours knocking about that Victoria wasn't going to show - but she always made it a priority," a source said.
"She was never going to miss the launch and is looking forward to seeing the rest of the girls. The musical is a proud moment for them all. It will be emotional."
Viva Forever - written by Absolutely Fabulous star Jennifer Saunders - will feature many of the iconic pop group's greatest hits.
Viva Forever opens at London's Piccadilly Theatre in December.
© Rex Features / David Fisher/Rex Features
© PA Images
Earlier this year, Mel C dismissed rumours that the musical had been delayed due to a difference of opinion between her and Mel B, adding that she was "starting to get very irritated" with the claims.
> Mel C would be angry over Spice Girls Olympics snub
> Emma Bunton 'excited' by Spice Girls musical
Watch the video for the Spice Girls' 'Viva Forever' below:
