The "I Need Your Love" writer appears to be the lone guy invited to Taylor's most recent superstar get-together, which this time included Ellie Goulding, Lorde, Neighbors actress Halston Sage, Empire star Serayah, and the Haim sisters.
Check out the gals looking impressively photoshoot-ready atop a vintage-style bicycle.
Serayah also posted this cute black-and-white selfie of the girls hamming it up for the camera.
Ever the gentleman, Calvin also made sure to take care of his frequent collaborator and close friend, Ellie.
"Shoutout to @CalvinHarris for hooking me up with vegan bbq tonight," Ellie tweeted.