Taylor Swift and Brittany Mahomes have quickly become besties on the sidelines, sharing a secret handshake and nearly breaking the internet as they do so.

During the second quarter of the Kansas City Chiefs game against the Los Angeles Chargers on Sunday, Oct. 22, the two pals were spotted celebrating after a touchdown, cheering and clapping as the Grammy winner turned to Mahomes, 28, with a gesture signaling that now was the time.

Swift, 33, and the retired soccer player then began slapping each other’s palms in sync before grabbing each other and ending the handshake with a hip bump.

The moment immediately went viral as fans of the “Look What You Made Me Do” songstress gushed over the gal pals friendship.

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“What is that shake? Some secret handshake?” one eagle-eyed fan questioned as another simply dubbed it “The Handshake.”

“Too cute hahaha!!!” someone else exclaimed.

“She is so full of life!!!” a third wrote. “She makes me smile.”

“Girl isn’t hiding anymore. Just [living] her best life 🙌❤️,” another Instagram user added.

Sunday’s game was Swift’s fourth appearance, cheering on her new beau, Travis Kelce, and she made sure the world knew who she was there for with a tiny friendship bracelet outfitted with the tight end’s jersey number.

It appears she’s thick as thieves with Kelce’s teammates–or at least with their wives–as this isn’t the first time she was caught bonding with the wife of Chiefs quarterback Patrick Mahomes. Last month, the two were photographed together while out for a Girls’ Night. Swift has also gotten in with Kelce’s parents and even invited some of her friends to join her on the sidelines.

All we need now is for fans to agree on their celebrity nickname!

Next: What Travis Kelce and Taylor Swift Plan to Do About Romance Once Eras Tour Resumes

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