Please Welcome to the Stage: Every Single Surprise Taylor Swift Guest

Who?! It seems like Ellie Goulding always has a huge, hot single on her hands! Between "Lights," "Love Me Like You Do," and "I Need Your Love," we've always got her stuck in our head.

Where?! Ellie Goulding joined Taylor in Texas.

Why?! Ellie and Taylor definitely run in the same social circles. Plus, let's not forget that Elli was in the "Bad Blood" video.