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What was she thinking?!

While Kim Kardashian has been showing off a lot of skin recently in a few cleavage-baring ensembles, she changed it up on Monday ... and we're not feeling it, at all.

The reality TV star stepped out yesterday in a backless white sweater, skin-tight white skirt and tan suede heels. And while we credit Kim for actually wearing a bra, did we really have to see it?

PHOTOS: Kim Flashes Nipples In Sexy Bikini Pics

Yes, the outfit does look pretty great on her from the front ... but the second she turned around, flashing her exposed underwear, it just looks tacky.

The 33-year-old was spotted going to her Dash store on Melrose in Los Angeles with sisters Kourtney and Khloe Kardashian, who fared much better than Kim in bright and colorful, summer-friendly looks.

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Kourtney gave fans a peek at her growing baby bump in a purple romper, while Khloe flaunted her impressive stems in a blue wrap dress.

Whose look do you like best? Vote above!

The sister sighting comes days after they all celebrated North West's first birthday with one amazing Kidchella-themed party in Kourtney's backyard. The festivities included a ferris wheel, bounce house, food stands, karaoke stages, face-painting and more.


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