Katy Perry is taking a moment to look back before she steps forward. The singer, who spent much of the year on the road for her Lifetimes Tour, shared behind-the-scenes photos and rehearsal clips, giving fans a peek into the creative process. A Love Letter to FansPerry described 143 as her own way of saying "I love you" to her fans. "History is important, we learn from history, we are reminded of how to and what not to do when we look back," she shared. What Katy Does NextPerry ended her letter with a story about a friend who once gifted her a book titled What Katy Did Next.