Photos: What Were They Thinking?!

This week's worst-dressed stars include Katy Perry, Rihanna, and Vanessa Hudgens. Katy Perry:

Pop tart Katy Perry left little to the imagination in a sheer ensemble while out and about in Paris on Thursday. While we adore her coral-colored Jimmy Choo handbag and strappy Christian Louboutin sandals, we abhor her tired blue tresses and minty Vera Wang mess of a dress. Oh, and those granny panties ... they belong under sweatpants, not on display during Fashion Week! Rihanna:

Perry's pal, Rihanna, was also recently spotted in an equally atrocious outfit. The "S&M" songstress was photographed in London unsuccessfully attempting to resurrect the unfortunate visor trend of 2002. She then dared to pair her hideous black Fleet Ilya headpiece with a slashed sweatshirt and cuffed jeans.

A day later, RiRi stuck out in another RiRidiculous getup, which consisted of a flat-brimmed baseball hat, baggy denim top, studded Daisy Dukes, and thigh-high leather Louboutins. Which of her looks was lousiest? Vanessa Hudgens:

Dear Vanessa Hudgens, there is such a thing as too much fringe. And while we're on the topic of your fashion faux pas, your black Chanel bag and matching hoof-like heels are the worst possible accessories for such a bright (i.e. heinous) outfit. xoxo, omg! Lil Kim:

Lil Kim stepped out on Wednesday night for BET's Rip the Runway 2012 at the Hammerstein Ballroom in New York City, but apparently left her eyebrows at home, as they were missing from here face in photos. Snooki:

Zebras and tigers and cheetahs, oh my! Snooki never met an animal print she didn't love. Snooki reportedly using bags and loose clothing to hide pregnancy www.realitytvworld.com/news/snooki-reportedly-using-bags-and-loose-clothing-hide-pregnancy--13203.php Anika Noni Rose:

Anika Noni Rose delivered a style no-no upon arriving at Elton John's annual Oscar party in this revealing Basil Soda bomb. The singer/actress is beyond beautiful -- and we're loving her exaggerated bun -- but, showing this much skin at an AIDS fundraiser is a tad tacky. Johnny Depp:

Johnny Depp continued to confound as he left his New York City apartment in yet another hipster-railroad worker ensemble. The two-time "Sexiest Man of the Year" is looking a little rough around the edges, don't you think? Florence Welch:

Florals are tough to pull off even when confined to one article of clothing in one's ensemble. A full-on floral? Now, that's just nuts. But Florence Welch (of Florence and the Machine fame) was willing to go there, so we'll give her props. Her Moschino suit, however, should be burned. Immediately. AnnaLynne McCord:

If it's cold enough in Santa Monica, California, for a heavy coat, knee-high socks, and fur-wrapped Uggs, perhaps "90210" minx AnnaLynne McCord should also be wearing some pants!