Megan made everyone green with envy with her regal yet risqué ensemble by Azzi and Osta.

The Transformers alum lit up the red carpet with an emerald green get-up that featured geometrical cut-outs, which showed off her toned physique. The dramatic fabric that wrapped around her waist, along with the design's one-sided sleeve gave it much more edge.

She tied her look together with silver diamond jewelry pieces and black sandal heels by Giambattista Valli that had chunky gold chains on the straps.

Not that we'd expect anything less from the star but she certainly pulled out all of the style stops for the fanciful affair. And considering she's a presenter tonight, it's easy to see why she dressed to impress.

As for Machine Gun Kelly? The rapper opted for something electrifying instead of the basic black-and-white tuxedo. He donned a silk white outfit by Balmain. His blazer top had a plunging neckline and puffed sleeves, which perfectly complemented his joggers and shiny silver boots.

Like Megan, the "Bloody Valentine" star is a big deal tonight. He will take center stage and perform at the 2020 AMAs. He even teased his upcoming performance with Travis Barker hours before the star-studded show.

"me and @travisbarker performing (and revealing something special) on the AMA's tonight," he shared on Twitter. 

It's only a matter of time before viewers learn what MGK has up his sleeve.

Of course, tonight's ceremony will feature an incredible lineup of performers.

Katy Perry, Megan Thee Stallion, BTS, Maluma and many other artists are expected to take the stage. In fact, Justin Bieber will perform for the first time in four years at the 2020 AMAs, so you know it's going to be one for the books.

For the latest and greatest updates on the 2020 AMAs, E! News has you covered. Click here for the most up to date coverage.