By ETonline Staff
9:16 PM PDT, May 17, 2015
Check out the best and worst dressed from the 2015 Billboard Music Awards.
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Best - Jennifer Lopez

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Fresh off the announcement of her upcoming Las Vegas residency, J.Lo rocked the red carpet in a super-revealing sheer Charbel Zoe dress.
Worst - Chrissy Teigen

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The Billboard Music Awards co-host had a lot of fabulous outfits over the course of the night. This black-and-white draped dress was not one of them.
Best - Kelly Clarkson

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The singer was pretty in purple as she performed her new single "Invincible."
Worst - One Direction

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Some of the boys looked a little schlubby at their first awards show appearance since the departure of Zayn Malik. Maybe Zayn was the true fashionista of the group?
Best - Laverne Cox

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The Orange is the New Black star sparkled in a white Marc Bouwer minidress with silver and Austrian crystalaccents.
Worst - Charli XCX

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The singer has often spoken about having synesthesia, a neurological condition where a person can see vibrant colors stimulated by their other senses. So what's with all the black?
Best - Celine Dion

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The 47-year-old singer stunned in a short dark green dress when she presented the award for Best Male Artist.
Worst - Iggy Azalea

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Between the nude panel on her baby blue skirt and her pink tips, we're not sure what was going on with Iggy's washed-out look.
Best - Lily Aldridge

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The model and "Bad Blood" music video star rocked a black and purple striped dress with a super-high thigh slit on the red carpet.