"We really support each other and the decisions that we make and we really support her and she's really supporting us so I think that's a big part of our ethos", she said.
In a video accompanying the tweet, there was footage of each member apart from Beckham above a ticker headline: "Friendship never ends: Spice Girls announce shock United Kingdom tour".
Mel C "led the charge" for the Spice Girls reunion.
Meanwhile, TMZ has reported that the "Mama" hitmakers - who won't be joined by Victoria Beckham - will earn over $3 million each for their six date stadium tour net summer. "That's all!" she said.
The 1990s pop phenomenon will take the stage in six British cities next year, including Manchester on June 1, the Scottish capital Edinburgh a week later and culminating at Wembley on June 15.
Speculation is mounting that more dates will be added once tickets go on sale at 10:30 GMT on Saturday. "And now I'm gonna go because I'm gonna cry.' And she ran off and actually it was so quick, I didn't realise until I was halfway down the stairs and someone went 'that's Adele".
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"I've always said we're going to get back together", she told Evans.
'I was so frightened to do anything after the Olympics because it was such an incredible experience, but spending time with the girls... our fans are incredible and have supported us forever... but also when we are together we have so much fun'.
Fans of the girl band would now be able to see Emma "Baby Spice" Bunton, Geri "Ginger Spice" Halliwell Horner, Melanie "Mel C" Chisholm and Melanie "Mel B" Brown perform on their tour. "But you just feel different as time goes by".
He gushed: "We also have an extra special Spice Girls surprise because I can now reveal that tomorrow morning on Heart Breakfast, the Spice Girls will be here!"
Wishing them all the luck, she said, "I know they will put on an awesome show and the fantastic fans past and present are going to have a wonderful time!"
The six show United Kingdom tour will mark the first time the group has performed together since the 2012 Olympics.