Taylor Swift's Squad Gets A Big Addition With Little Mix — Watch Their Black Magic Takeover HERE!

Ok, Taylor Swift, we get it! You know everybody! LOLz!!

After a concert on Friday night where she brought Fifth Harmony on stage, Swift did it again Saturday with Little Mix -- and Joan Baez, and Julia Roberts!!

[ Video: All Of Taylor's Friends Come Together For Bad Blood ]

Swift held her second northern California concert on Saturday night and didn't hold back, this time bringing in the girl group to perform Black Magic as an ensemble. Ch-ch-check out the video (below):

And if that...

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