Demi Lovato serves up flapper realness on AMAs red carpet

Hollywood has a mild case of Gatsby fever.

Earlier this month, the Kardashians hosted a Great Gatsby-themed bash celebrating matriarch Kris Jenner's 60th birthday. On the American Music Awards red carpet Sunday night, Demi Lovato similarly rocked a flapper-style gown and 'do with some serious roaring '20s vibes.

She wasn't the only one who turned heads at Los Angeles' Microsoft Theater.

Carrie Underwood sparkles: 

Gigi Hadid shows some skin: 

Selena Gomez glimmers in ruby red: 

One Direction's Harry Styles wears your mom's couch: 

And Justin Bieber showed off his Nirvana fandom: 

All the looks from the AMAs carpet: