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Taylor Swift, Meredith, Olivia Benson, Calvin Harris, Instagram

Instagram, Getty Images

Well this just takes fear of missing out (FOMO) to a whole new level.

Taylor Swift and her entire posse—we're talking girlfriends, rumored boyfriend Calvin Harris and even her catshad quite the hangout sesh yesterday (or so we've surmised from Instagram).

Let's begin with the most important photo of the night: Calvin's "Moment" with cats Meredith Grey and Olivia Benson. The sexy DJ/model isn't actually in the snap, but it lets us know he's spending some quality time with Tay's nearest and dearest. (Don't you wish you could see what those two were looking at off to the side? Meredith looks a little apprehensive, but Olivia's assumed a quite curious meerkat stance!)

Sereyah, Haim, Lorde, Taylor Swift, Instagram

Instagram

Calvin Instagrammed another pic of Ellie Goulding, Halston Sage and Alana Haim. Based on these ladies' party pics throughout the night, we can tell that these women—plus Serayah and Lorde—were all hanging out with a certain "Shake It Off" singer yesterday afternoon and into the evening.

Ellie Goulding, Sereyah, Taylor Swift, Instagram

Instagram

Taylor captioned one group shot of the gang (sans Calvin, who may well have been behind the lens), "Real love." The other gals shared sweet sisterly shots, too.

Lorde, Taylor Swift, Instagram

Instagram

Calvin wasn't the only fella in Tay's crew last night, though—for at least a portion of the evening, DJ Dillon Francis was hanging out with the group, too. Calvin Instagrammed a pic of his buddy rocking a blond wig, and on Dillon's Instagram, there's a video of him wearing it as he does his best Taylor Swift impersonation...for Taylor Swift herself.

Dillon Francis, Calvin Harris, Instagram

Instagram

This short, slightly confusing video makes it unclear whether Mr. Francis was also part of the homey festivities with Taylor, Calvin, her gal pals and her cats.

Again, though—FOMO to the max!

—Additional reporting by Holly Passalaqaua