After the performance, Gomez gushed over her friendship with Swift. "The reason why she has been one of my best friends is because this person has never, ever judged a single decision I've made," the 25-year-old reportedly told the crowd. "But honestly, thank you from the bottom of my heart for supporting someone that I know that is the most beautiful, strong, independent woman I've ever met. So thank you for supporting my best friend." Cue the tears!
Watch a clip from their adorable performance ahead.