There's more of a story to Katy Perry's black hair than you may think. 

"It's black [because] I'm in mourning because this tour is almost finished," Perry told E! News.

The "Fireworks" singer, whose hair has previously included pink, blue, green, purple and blonde, suggested that she's a bit too tired for a major hair color change right now. 

"I think it's time for me to have a nap, a little sleeping beauty for a second," Perry told E! News. 

While donning her fierce black hair, Perry is getting ready to see her new concert movie "Katy Perry: Prismatic World Tour" premier on March 28 at 8 p.m. on Epix. 

A few days before the premiere, on March 26, Perry watched a sneak preview of the concert movie at the Theatre at Ace Hotel in downtown Los Angeles. 

Despite the big crowd, Perry told E! News she wasn't nervous about showing the new movie. 

"I was in the editing bay for quite a long time in different spots around the world because I wanted to make sure I wasn't nervous and proud of the presentation of this tour because this tour has been kicking my butt all over the world for almost a year," she said.