She did wish the girls luck in an official statement that read, "Being in the Spice Girls was a hugely important part of my life and I wish my girls so much love and fun as they go back on tour, I know they will put on an unbelievable show and the fantastic fans past and present are going to have a wonderful time!"
The Spice Girls are expected to announce their big reunion tour today.
And Mel has now admitted she was the one who pulled the plug on the tour because of difficulties in her marriage to now ex-husband Stephen Belafonte.
Victoria Beckham has opted not to join the tour but Mel is still hopeful she'll make an appearance on the tour at some point.
This is the first time the Spice Girls have toured since their 2007-2008 reunion tour, though all five members reunited for a performance at the London Summer Olympics in 2012.
ET previously reported that the hit girl group was set to reunite for an eight-show stadium tour in the United Kingdom next year.
'We're going on tour!
'She's got a full-on life with all of her work commitments, her fashion line and all of her kids, so she's not committing just yet.
While the "Viva Forever" singer is confident the tour will be well-received, she admitted some of her bandmates were more cautious.
'But I'm holding the torch. "We are always overwhelmed at how much interest there is across the whole world for The Spice Girls".
In the official press release, Halliwell added, "I am so excited, together we celebrate girl power with our fans and the next generation and everyone is welcome!"