Teigen, who arrived to the event with husband John Legend, took her Twitter off public and responded to a number of tweets criticising her outfit choice.
"I am pretty sure you can tell I'm a lady", the star responded to a user who Tweeted "Underwear-free @chrissyteigen what happened to being a lady? #SMH".
The mum-of-one also took to the AMAs stage in the same dress to introduce Legend's performance of his latest song, "Love Me Now'.
"This next performer is a brilliant musician and a wonderful father, who makes a pretty damn good breakfast sandwich," she said.
"He has been known to write love songs about me. What can I say, I'm very inspiring."
"But his songs are bigger than either of us," she added. "And on the heels of what’s been a really interesting, f***ed up f***ing election for all of us, we can all use a little love tonight."
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