Katy Perry was killing the fashion game in an avant-garde Kate Barton look as “American Idol” did its first live show of Season 22! She opened up about her decision to step away after this season, explaining that being a mother is important to her, and she needed to “create space” to do other things as well. She also played coy about that teaser she gave at the Breakthrough Prize Ceremony via a white scroll in her transparent purse that read, “KP6 Top Secret.” Is new music coming?