Katy Perry is known for her changing but trendsetting styles, and she has no problem showing off all those sexy looks on ...

The singer looked like she was ready for another high-fashion trip to space with futuristic costumes to kick off her tour.

Katy Perry, Jessica Alba and others embrace skin-baring looks, as the temperature continues to rise. Perry wore a revealing gown on the carpet, while Alba posted photos in a bikini.

Ellen Cushing, writing for The Atlantic, proclaimed Ms. Perry to be the “perfect pop star for a dumb stunt.” Various celebrities, like the actress Olivia Wilde and the model Emily Ratajkowski, ...