Lady Gaga, the Kardashian sisters, Katy Perry & more of this week's best & worst dressed celebs

Fab or Flop 10.31
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Lady Gaga, the Kardashian sisters, Katy Perry & more of this week's best & worst dressed celebs
In a sexy black jumpsuit, Rosie Huntington-Whitely is simply stunning.
We love a good black, white, and gray combo outfit, but Kelly Osbourne's look has too much going on for us.
Mandy Moore's got the right idea with her perfect orange pout and sheer dress that makes a stylish statement.
The three famous sisters stepped out for Kim Kardashian's 33rd birthday party in complementary black and white looks.
Lady Gaga may be rocking Louis Vuitton spring 2014, but we're not a fan of the look that's less than reasonable for the every day.
We realize the Skinnygirl maven and talk show host was dressing up for Halloween, but this costume can be described as no other way then: over the top.
In all white, the Girls star shows off her radiant beauty.
Katy Perry can make an album shoot to the top of the charts, but we're not a fan of this look from the pop star.
Seriously, when doesn't Beyonce look completely fabulous?
There's nothing we can say about Lady Gaga's latest look. We just hope she doesn't take a fall!
Lace is currently one of our favorite trends, and this number worn by new mom Kim Kardashian, is absolutely gorgeous.
Ditching her usual black and white-only style, the Kardashian matriarch Kris Jenner looks gorgeous in a patterned blue dress.

From charity events to premiere parties, celebs were out in full force this week looking hot, and in some cases, not so hot. From Kim Kardashian's sexy lace number to Katy Perry's casual airport outfit, we've rounded up all of this week's best and worst celeb looks.

Click through the gallery above to check out the best and worst of this week's celeb style!
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