Could this mean an upcoming album is in the works?
Perry announced the semi will be making other stops across the country -- good news for fans outside southern California.
Find the #PRISM semi, take a picture and I'll RT you. Don't worry, Los Angeles is just the first stop on the map.— Katy Perry (@katyperry) July 30, 2013
The album would be the follow-up to Perry's 2010 multi-platinum "Teenage Dream."
In addition to a new album, the singer is preparing to make the world a better place -- or at least, smell better. Perry unveiled her new fragrance line "Killer Queen" earlier this month. The scent will hit shelves in August.