04/20/2012 08:43 am ET Updated Oct 11, 2012

Rihanna, Katy Perry And 21 More Worst-Dressed Celebrities Of The Week (PHOTOS)

Here at Stylelist, we embrace all styles -- but there are always a few that raise our eyebrows. This week we saw celebrities stepping out in ill-fitting clothes and poor patterns. And we were also unfortunately reminded about the old adage re: horizontal stripes. Remember people, vertical stripes create an elongated silhouette. (And that's all we'll say about that. Even better, try the "miracle dress" -- those dark panels on the side create an optical illusion that is hard to pass up.

Take a cue from these stars and banish leggings from your professional wardrobe and, while we're at it, take your too-big items to the tailor. Here, 23 stars whose fashion flops are a lesson in how not to dress. Then check out our picks for best-dressed stars this week for some wardrobe inspiration.

In related news, is Scarlett Johansson's latest look fabulous or fashion faux pas?

Worst Dressed 4.20.12

Want more? Be sure to check out Stylelist on Twitter, Facebook and Pinterest.