Pretty in purple!
Rihanna celebrated her Fenty Beauty collection in London on Sept. 19. The “Love On The Brain” singer had a modern princess moment wearing a lilac strapless ruffle tulle, layered mini-dress by Molly Goodard styled with Chopard and Anabela Chan jewels and metallic wrap around sandals. Totally the best dressed star of the week!

On the other hand, Katharine McPhee turned heads for the wrong reasons. The singer arrived at the 2017 Grammy Museum Gala honoring David Foster in a ultra revealing in Martha Medeiros number. But unfortunately the look came across more tacky than tantalizing. Sorry, worst dressed star of the week.
