Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Last night, the Billboard Music Awards took place in Las Vegas. Many celebrities who aren't famous enough to not go attended, and they were all treated to a Michael Jackson hologram that no one asked for.

And the outfits were all over the place — some attendees wore shorts; others wore flowing ball gowns. J-Lo didn't wear pants.

So, without further ado, here are the looks from last night:

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Nicki Minaj looks absolutely glorious in a cut-out Alexander McQueen dress; she's been opting for simpler looks lately, and it's really been working on her (that is some very sophisticated under-boob).

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

And here she is being all sassy, which is one's prerogative when they look that good.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Jennifer Lopez (with boyfriend Casper Smart) came dressed like a very sensual sorceress — a flowing crimson, sheer robe concept by Donna Karan and no pants. She looks great.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Kesha (still can't believe the dollar sign is gone; may it rest in piece) also went much more sophisticated than she has in the past — this is a straight-up evening gown, which some might consider a little much for the BMA's, but I'm not complaining. Her tousled hairstyle is perfect, and she looks really healthy and lovely.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Kelly Rowland wore a very excellent formal crop top. Best Formal Bra of 2k14, so far, I would say.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

And here's Carrie Underwood in a yellow Oriett Domenech gown with beaded embellishments. The design is very pretty, and it fits her exquisitely, but the color is horrid. It looks like radioactive pee.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Kendall and Kylie Jenner kept it relatively simple in a halter top and slip dress, respectively. It appears that bad case of the Tumblrs is gradually seeping into Kylie Jenner's brain, starting from the tips of her hair. It will reach the crown of her head eventually, I fear.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Amber Rose and Wiz Khalifa both wore crisp blazers. Amber Rose also donned a segment of a Daft Punk helmet.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Chrissy Teigen and John Legend were looking very cute. She wore an architectural Fyodor Golan dress and a luxurious wig (which she put on her dog after the event).

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Various degrees of sheer cut-outs: Renee Bargh went with delicate details, paired with fancy shorts; Shania Twain's black gown was a bit more dramatic; Charli XCX went full-out. It kind of looks like a very elegant apron that the witch queen might don while potion-brewing (which is a compliment).

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Pretty in pink: Lucy Hale color-blocking; Miranda Lambert with a plunging neckline; Danica McKellar in a cutout dress.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

More cutouts and formal midriff, white edition: Lauren Elizabeth and Liz Hernandez went for it, whereas Aubrey Peeples was a bit more demure (boring).

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Keltie Knight wore a bright, mod patterned ensemble, Sarah Hyland rocked a Pucci skirt and jacket, and Shakira wore a sequin blue dress with completely sheer sides.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Little black dresses: Jordin Sparks all shimmery, Rocsi Diaz all sleek and cut out, Andi Dorfman with gold embellishments. Not the most exciting choices, but I guess not everyone can wear a dress with see-through sides.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Looking all theatrical, feat. sheer and sequins, we have Cher Lloyd in purple, Iggy Azalea (with Nick Young) in burgundy and Dencia bright red.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

The bad: Lindsey Stirling in a feather duster, Natasha Bedingfield in a floral condom, Estelle in a crossing guard's vest.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Some men! Ludacris looked really fun withall of his pink accents; 2 Chainz wore several chains; Cris Angel wore loafers emblazoned with roses because sure why not.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Here's a closer look at 2 Chainz's sneakers, which are beautiful.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Jack Antonoff of Fun., that band of civil war re-enactors with a pop sensibility, cuffed his skinny jeans and wore a baseball hat; That Guy from that TV show who tricks unsuspecting women into thinking he's Prince Harry wore something Prince Harry might wear, maybe; ♪ Ja-son Derulo ♫ looked cool in a splatter-painted t-shirt and high tops.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Looking more traditional, we have Pete Wentz in a skinny tie, Ricky Martin, with a #bringbackourgirls sign, and Josh Groban in all dark hues.

Formal Bras and the Occasional Ball Gown at the Billboard Music Awards

Billy Ray Cyrus is so pissed he had to get out of bed to hang out with all these damn kids.

Images via Getty.