But whether or not The Posh One caves under the pressure, Scary Spice is determine the show will go on.
"Mel B is spearheading the crusade for the band to do a reunion tour as they had a performing at the closing ceremony," a source close to the group told Radar Online.
"Vicky says she has way too much on her plate right now with her fashion label and so busy being a mother to four young children and wife to David and it just doesn't seem likes she wants any part of a reunion tour."
The pop star-turned-fashionista is reportedly well aware she'll look like a sourpuss if she refuses to join the Girls. And given she was gushing after their closing ceremony performance there could be hope yet.
Click here to watch the Spice Girls' performance at the London 2012 closing ceremony
Radar's source revealed "mama bear" Mel B wants to kick off a tour as early as December this year to coincide with the London premiere of the Spice Girls musical.
"[It] wouldn't need to be a full scale world tour that would last for months, rather they could perform in Los Angeles, New York City, Chicago, London and other big cities to promote the musical," said the source.
"The ladies are ready to perform with or without Posh Spice."
Fans would certainly be disappointed if Victoria chose to boycott the tour but we're more than confident Mel B could make up for the absence with her own killer stage presence.
The 37-year-old wowed audiences at the London closing ceremony and according to the Girls' post-performance tweets, even refused to take off her glittery cat suit until 6am the morning after!
Now that's dedication.