Tay-Tay has this whole teamwork thing down pat!
Taylor Swift is no stranger to sharing the spotlight -- she's done so quite a bit already on her 1989 World Tour throughout the summer, so why not keep the fun up again this weekend?!
[ Video: All Of Taylor's Friends Come Together For Bad Blood ]
At T-Swift's concert Friday night in Santa Clara, California, the pop superstar brought Fifth Harmony on stage to perform the girl group's hit single Worth It in front of thousands of screaming fans!