Ice Spice dressed up as cartoon icon Betty Boop for her iHeart Powerhouse performance on weekend.
Hailey wore a bright red wig with a neon-colored top and skirt. Her hubby went shirtless and sported furry, animal-print fabric around his waist.
The Demi Lovato made for a perfect Snow White in a corseted blue and yellow dress.
Paris Hilton swapped out the iconic blue Pan Am ensemble for an all red mushroom costume.
Ruched skirt and white bikini top, Halsey looked like an ethereal siren straight from the sea.
The Channing Tatum was the infant himself in a blue onesie and bonnet, while his girlfriend Zoë Kravitz accessorized her nightgown with a knife in hand, à la Mia Farrow’s titular role.
Jessica Alba channeled Britney Spears "Toxic" wardrobe at the Casamigos party. Kelly Sawyer Patricof completed the look with a bright blonde wig, silver stilettos and natural makeup.
Justin Bieber went as sported a snorkel mask and flippers paired with a floral shirt and pink shorts.
Camila Mendes got all dolled up in a sparkly Catwoman suit, and her boyfriend, Rudy Mancuso, who rocked a leather jacket.