Now that summer's here, it's time to make cool and casual looks as fab as can be! While some fashionistas can pull off the new season's trends, other celebs are left looking confused and going overkill with their style.

While supermodel Karlie Kloss stuns in a simple dress with a pop of bright color, Rihanna goes overkill with a glitter and iridescent mashup in London. And although Miranda Kerr can pull off casual chic, Kelly Rowland leaves us wanting more from her sorority-inspired look.

We've rounded up the best and worst fashion, style, and beauty looks of the week and dissected everyone from the Jonas Brothers to Sofia Vergara to Nicky Hilton.

What're you waiting for? Click through the gallery to check out all of this week's best, worst, craziest, and most controversial style.