A photo booth also helped the singer's fanbase to see what went down at the after party with attendees sharing a handful of images on the social media platform.
The polaroid-style snaps appear to show Gomez in yet another outfit after changing four times previously throughout the ceremony.
Kickstaring the sartorial proceedings as she meant to go on, the singer graced the red carpet in a $1,500 lime green cold-shoulder frock by Versace before switching things up for the stage in a minimal black gown.
Cue a sparkly leotard for the second (more upbeat) set before a final lace-adorned slip dress, also by Versace, made the final cut.
As if that wasn't enough for us to keep up with, the Disney alum's polished bob later transformed into a shaggy '90s 'do.
Gomez has yet to post much from the big night on her feed but did find time to share some polaroids taken during preparations.
In one of the images, she can be seen sporting a new tattoo emblazoned across her thigh by celebrity tattoo artist Bang Bang.
"AMAs day... more to come..." she teased in the caption.
The post also featured a photograph of Selena embracing her choreographer Charm La'Donna, who helped to pull together the performance.
But it wasn't just Gomez who had reason to celebrate, as close friend Taylor Swift was named both artist of the year and artist of the decade at the ceremony - taking her total of awards to a record-breaking 29.