Nene Leakes of RHOA showed off a slicked-back do (and that monstrosity of a diamond ring!) as she walked the red carpet.
Coconut the puppy was a no-show, but Shahs of Sunset star Lilly Ghalichi still managed to find a cute purse as her accessory.
Maybe Taylor Swift got her Grammys dress inspiration from Adrienne Bailon? Adrienne rocked a low-cut sparkly gold mini on the OK! RC.
Lance Bass, who's a good friend of some of our editors, walked the carpet solo but had a blast inside the party where he mingled with some famous friends. More on that later...
Joyce Giraud, the newbie of RHOBH, wore a stunning LBD for the soiree and was joined inside the party by her husband and some fellow housewives. Keep clicking to find out who!
Ryan Cabrera showed off his rockin' sense of style on the carpet. Lovin' the beanie, Ry!
Only RHOM's Joanna Krupa could rock a dress like that! She clearly turned heads both on the carpet and inside the shindig.
Jeannie Mai looked stylish as always at the party, rockin' a Garwood watch.
Jax Taylor of Vanderpump Rules left his chunky sweater at home and instead opted for a nice suit and tie combo.
He was joined at the party by his Vanderpump co-stars, Sheana Marie...
Tom Sandoval and Kristen Doute
...and of course, everyone's fave SUR couple, Tom Sandoval and Kristen Doute. Don't they look cute?
It's not a party without Farrah Abraham! The Teen Mom lady opted for a semi-demure look in a black dress with gold detail.
Is that a notebook he's holding? Singer/song-writer Mike Posner was probably looking for music inspiration inside the walls of that party!
Gretchen Rossi, who was tweeting about the party all night for @OKMagazine, went super trendy in a tight bright skirt and a black crop top.
Kyle Richards and Mauricio Umansky
It was date night for RHOBH's Kyle Richards and her husband Mauricio Umansky. They both look stunning, as per youge.
Despite some legal troubles that the ladies of Real Housewives of Atlanta are currently having, Kendra Moore was all smiles at the party in a purple cutout maxi dress.
Jordin Sparks and Jason Derulo
Jordin Sparks and Jason Derulo were the couple of the night! The cuties walked the carpet together, and Jordin later introduced her man on stage.
James Maslow of Big Time Rush came to the party without his bandmates, but made friends with a bunch of ladies inside the party.
Switched at Birth's Lucas Grabeel made the matchy-matchy thing work in a grey blazer and matching grey fedora.
Christina Milian matched the step and repeat! We're lovin' her sexy white dress with mesh cutouts.
Alex Newell, who plays Unique on Glee, struck a pose for the carpet.
Adrienne Maloof was a guest at the party, but also got quite an honor! Her alcohol line, Zing, was the vodka of choice of the night.
Remember how we mentioned Jordin Sparks earlier? Here she is introducing her boyfriend Jason Derulo to the stage.
Jason Derulo was the best entertainment of the night. His set included tons of singing, dancing, and hot backup dancers.
Hmm. We wonder what Gretchen Rossi, Joyce Giraud, Kyle Richards and Joanna Krupa of Real Housewives were talking about...
Lance Bass and Karina Smirnoff
Lance Bass hung out inside the party with Karina Smirnoff of DWTS.
Bella Thorne was at the party too, and was on the dance floor much of the night with her adorable boyfriend, Tristan Klier.
Celebrity guests got to enjoy a wide selection of 5-gum. Hey, you never know who you could be making out with on that dance floor...
But what's the point of minty breath if your lips are chapped? Good thing Chapstick was on hand and giving out tons of yummy lip balm at the hydration station—and Smart Water gave out bottles of H2o, too!
Party-goers also got to sip on red velvet-flavored Zing Vodka.
But beer was on the menu, also! The bar was stocked with Zing as well as tons of Heineken and One Hope brewskies.
And because you can't have a party without great hair, guests also were given free Herbal Essences naked products to use at their leisure.
Le Vian Jewelry
Le Vian jewelry also had a presence at the party.
And after that all that drinking and partying, even famous people need a little help! Each attendee walked away with Never Hungover, a hangover cure that's a must after a crazy fun night like this one.