Shawn Mendes belted his heart out in a sentimental rendition of "In My Blood" at the 2018 Billboard Music Awards.

On Sunday (May 20), the 19-year-old artist captivated an enthusiastic crowd of thousands with a passionate performance of his rock-heavy tune at tonight's BBMAs. The display was so powerful that it sent two notable female musicians on their feet and dancing.

The fangirls in question? Taylor Swift and Camila Cabello!

The "Havana" star and "Delicate" pop darling have been known to show off their dancing skills at music ceremonies in the past. So when the opportunity presented couldn't resist the urge to jig together as the Canadian crooner rocked on with his guitar.

Also noticed falling victim to Mendes' charm were none other than his biggest South Korean fans, K-pop boy banders BTS, who were spotted bobbing their heads and mouthing the lyrics in the crowd.

Check out BTS' reaction to Mendes' BBMAs set, below.

2018 Billboard Music Awards Red Carpet

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