The stage show was recently said to be facing delays due to the pair disagreeing over various details of the production.
© PA Images
© LUCA BRUNO/AP/Press Association Images
However, the 'I Turn to You' singer has said that the show is "coming along beautifully" and that everyone involved is getting on well.
Referring to a Grazia article, she tweeted: "Starting to get very irritated with reports that myself and @OfficialMelB are 'bickering' over the Spice Girls musical. Now @Grazia_Live are at it. Maybe I should cancel my subscription? Aaaaaaaarrrrrgggghhh!"
Jennifer Saunders confirmed in 2010 that she would write the musical, containing several of the girl group's biggest hits.
Emma Bunton, Victoria Beckham, Geri Halliwell, Mel C and Mel B are involved in the project, but will not appear in it.
Mel C added: "The Spice girls musical is coming along beautifully and all of us girls, [Jennifer Saunders] and Judy Craymer are very happy!!!"
The musical was originally scheduled to open in London's West End sometime in 2012.
Mel C recently spoke about her battle with depression, and said that giving birth to her daughter Scarlet Starr helped her have a "fresh start".
Watch the video for Mel C's 'Weak' below:
