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From Gigi Hadid's hair to Gwen Stefani's sheer and sexy Yousef Al-Jasmi gown, there was plenty to see on the red carpet at the American Music Awards on Sunday evening.

Gigi looked incredible in a custom Bao Tranchi top and skirt, but rather than chopping off her hair, her longer locks were reportedly tucked in the back of her 'do. Whew!

And speaking of pure sexiness, we can't get over how incredible Gwen looked. Can you believe she's 46? The singer, who has been through quite a lot romantically over the last few months, hit the stage and performed a rather emotional rendition of “Used to Love You” ... check it out below: