Ariana - who was recently announced as the new face of high-street fashion hot-spot Lipsy - ignored all of the red carpet rules and donned this gorgeous scarlet number which boasted a huge train, a fishtail hem and a super-sexy bralet to boot.
Eesh! We need a fan over here...
Even though Chrissy Teigen, Lady Gaga and Taylor Swift were all in attendance, the One Last Time songstress totally owned the swanky event as she pulled a series of sassy hand-on-hip and over-the-shoulder poses for the photographers.
She knows how to work it, right?
Ariana stayed true to her trademark high ponytail which allowed her to flaunt a seriously sharp contour and a pair of chandelier earrings which she co-ordinated with a pearl and diamante adorned wrist cuff.
As always, Ariana's feline flick was on point and she blew a number of cheeky air kisses to the paps before sashaying on into the venue.
Girl crush alert, girl crush alert!
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