2016 iHeartRADIO MuchMusic Video Awards

Hollywood's "It" girls stole the spotlight at the 2016 iHeartRadio Much Music Video Awards on Sunday night in Toronto, Canada.

Gigi Hadid, who acted as co-host for the show that was dubbed the "biggest block party" of the summer, looked red hot in a bright red pantsuit by Thierry Mugler. She paired the bell-bottomed pants and matching blazer with a diamond choker, a long fishtail braid and a killer crimson lip.

Meanwhile, Shay Mitchell turned heads when she hit the red carpet with a new blonde 'do. The "Pretty Little Liars" star opted to wear a black silk Olcay Gulsen dress with a thigh-high slit and gold vintage rosary waist belt.

If you're not feeling her lightened locks, don't worry, they're only temporary. The actress worked with celeb hairstylist, Chris Appleton, to go "blonde for the day," according to his Instagram. Yes, it's a wig -- one that colorist Shah K dyed dyed with golden tones, before Chris styled it to look like Shay's always-stunning 'do.

0620_gigi_inset2Launch GalleryInstagramBetter Blonde?!

Mitchell wasn't the only "PLL" star to represent the show in Canada. She hit the red carpet with Ashley Benson, who left little to the imagination in a pale pink Juan Carlos Obando dress, which featured a plunging neckline and a high-low hemline. The blonde beauty accessorized her simple silk dress with nude Stuart Weitzman stilettos, perfectly tousled waves and Messika jewelry.

Click through the gallery at the top to see all the hottest stars at the event, including Hailey Baldwin, Lucy Hale, Nick Jonas, Hailee Steinfeld and many more!

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