Last week Nick Carter excited thousands of fans online when he tweeted singer Mel B, asking what she thought about a possible joint tour between the Backstreet Boys and the Spice Girls, which Nick said "could be epic."
ET spoke with Nick after Monday's episode of Dancing With the Stars where he revealed what it would take for the tour to really happen.
NEWS: Backstreet Boys Are Teasing Fans With Hints of a Possible Spice Girls Combined Tour
As it turns out, it's all up to the fans.
"Just keep tweeting. Trend it if you want it!" Nick said, referring to the #backstreetboysspicegirlstour hashtag he wrote in his tweet to Mel B days ago. "Gotta get it trending!"
Nick went on to say that if the tour does actually happen, the Backstreet Boys are going to need the bigger dressing rooms.
"We're some prima donnas," Nick admitted, laughing.
WATCH: Nick Carter Just Made Every Backstreet Boys Fan's Dream Come True on DWTS
On DWTS last week Nick made every Backstreet Boys fan's dream come true when he danced to BSB's 1997 hit "Everybody (Backstreet's Back)" with pro-partner Sharna Burgess. Check out the magical, retro moment.