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Beyonce is known for her sexy costumes -- but her latest may be her most risque yet!

The singer kicked off her Mrs. Carter World Tour in Serbia on Monday, where she hit the stage in a look that had many in the audience thinking she was topless.

The sizzling "dress" was detailed in sequins that formed the outline of bare breasts, nipples included.

It's definitely a different look for Bey, who wore a number of outfits that out her impressive legs on display all night long.

Check out the gallery above to see the rest of her wardrobe from the tour. What do you think of the faux-revealing look? Sound off below!

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