If we know about Taylor Swift, it's that the girl loves her gal pals.
Officially, Taylor's best friend is Karlie Kloss, but Swifty has said herself that there are several young women she considers to be her besties, including Selena Gomez, Lena Dunham, and the ladies of the all-sister indie rock band, Haim.
Even if you're not familiar with Haim's music, you'd likely recognize them from Taylor's social media pages.
In the viral photo that finally revealed Taylor's belly button, for example, Swifty is seen partying in Hawaii with the Haim sisters.
That particularly vacation may have ended with some trouble in paradise, however, as Taylor is reportedly dating Canadian singer-songwriter Tobias Jesso, Jr., who happens to be the ex-boyfriend of the youngest Haim sister, Alana.
Of course, the Taylor-Tobias relationship is still in the rumor stage at this point, and for all we know, Alana may have given Taylor her blessing to hook up with her ex.
It's worth noting, however, that Alana still tweets about Tobias frequently...sometimes even using the dreaded heart-eye Emoji.
So it's possible that Alana is still good friends with Tobias. But it's equally possible that she still harbors feelings for the dude and is planning to team up with Katy Perry for an all-out musical cat fight for the ages.