The superstars and co-host nailed their red carpet outfits, along with Charli XCX and supermodel Kendall Jenner
There was plenty of sparkle in Vegas tonight on the red carpet ahead of the Billboard Music Awards.
Uncharacteristically, Taylor Swift even decided to show a bit of skin in a chic cut-out white jumpsuit with a plunging neckline as she spent the night cosied up to boyfriend Calvin Harris.
She matched her glamorous outfit with a pair of sky-high silver heels and wore her blonde hair straight resting on her shoulders with a stylish sweep fringe.
Taylor, who premiered her Bad Blood video tonight at the ceremony, also carried a black purse with the song title printed on the front, just in case anybody had forgotten.
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This one showed even more flesh but Jennifer looks as though she's still in her twenties and has a body die for, so of course she pulled it off.
The singer and actress completed her look with a matching silver clutch bag, chunky rings and pointed white shoes, while wearing her blonde hair in waves.
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She opted for a pair of pointed gold heels and carried a black clutch, making sure she too was dripping in jewels for one of the biggest nights on the showbiz calendar.
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Her hunky husband wore a spotted navy suit with a white shirt and pale purple pocket square, before changing his outfit for a performance with Meghan Trainor.
Chrissy also switched up her wardrobe a number of times for the show, going for a red busty strapless gown with a gold belt as she presented on the night with rapper Ludacris, along with a sexy black number.
Others named on our Best Dressed List tonight include Kendall Jenner in black Balmain for H&M, model Lily Aldridge and singer Charli XCX.