Nope, it's not a costume...

Diane Kruger looked like she was wearing a costume straight out of HBO's "Westworld." So unless Kruger was on her way to an audition, this look does not work. Click here for more pics of the actress on <a href="http://www.X17online.com" target="_blank">X17online.com</a>. (X17)

Kylie Jenner stepped out in a bright purple, shredded outfit that looked more like a racy muppet costume than a dress. <a href="http://www.x17online.com/2017/01/kylie_jenner_cleavage_purple_dress_cindy_crawford_marie_claire_afterparty_photos_video_011117" target="_blank">Click here for more pics of Kylie.</a> (X17)

Lady Gaga wore this ensemble to walk the streets of New York on a cold October day after she taped "The Howard Stern Show." (Splash)

Madonna wore this tacky ensemble to the Met Costume Gala in NY. She took the "Punk: Chaos to Couture" theme a bit too far. (Reuters)

Rihanna may be trying to give off a bad girl vibe, but she looks more like a bad boy. For more pics of Riri, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (X17online.com)

Sarah Jessica Parker is usually known for her savvy fashion choices, but this one is an epic fail. (Reuters)

Taylor Momsen isn't trying out for the next "Twilight" movie, she's just heading into LAX to catch her flight. For more pics of Taylor, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a> (X17online.com)

You'd think Kelly Osbourne was on set for an 80's music video remake. But no, she's just walking down the street. For more pics of Kelly, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="list-style-position: inside; border: 0;">Follow FOX411.com on Twitter.</a> (X17online.com)

Pop singer Ke$ha looks like she's been naughty with a smurf. <a href="http://twitter.com/@fox411" target="_blank" style="border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a> (AP)

Nope, she wasn't shooting a lingerie ad. This was Tila Tequila's outfit to celebrate her birthday at Mr. Chow's. For more pics of Tequila, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a> (X17online.com)

Christina Aguilera wore this sexy get-up to "The Late Show with David Letterman." Milk bowl not included. For more pics of Christina, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a> (X17online.com)

All Khloe needs is some ears and a tail and her "sexy zebra" ensemble is complete. For more pics of Khloe, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="list-style-position: inside; border: 0;">Follow FOX411.com on Twitter.</a> (X17online.com)

Okay, we know Rachel Bilson doesn't like to get recognized, but dressing like a hobo to pick up some groceries is a bit over the top. For more pics of Rachel, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> (X17online.com)

Katy Perry let's her animal instinct shine through in this realistic looking cheetah print sweater. For more pics of Katy, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> <a target="_blank" href="http://twitter.com/@fox411" style="list-style-position: inside; border: 0;">Follow FOX411.com on Twitter.</a> (X17online.com)

Her sister Kim has dressed up as Princess Jasmine before, so maybe Kourtney Kardashian is trying the Aladdin route? For more pics of Kourtney, go to <a href="http://www.x17online.com" target="_blank">x17online.com.</a> <a href="http://twitter.com/@fox411" target="_blank" style="list-style-position: inside; border: 0;">Follow FOX411.com on Twitter.</a> (X17online.com)