Taylor Swift and Nick Jonas are getting tight, and it might have something to do with her BFF Gigi Hadid dating his brother Joe [1]. But let's not forget Taylor and Nick go way back [2]. On Sunday, Taylor reminded us exactly how far back when she posted a picture comparing their performance from 2009 to her show on Saturday.

Nick took center stage with Taylor at her 1989 concert in East Rutherford, NJ, belting out his hit "Jealous." Although the duet may have been a big surprise for fans, we all should have seen a collaboration coming when Nick popped up in party pictures [6] from her star-studded July 4 celebration with Gigi and Joe.

Taylor's fans were also treated to cameos from Uzo Aduba, aka Crazy Eyes on Orange Is the New Black [7], and models Gigi, Martha Hunt, Candice Swanepoel, Lily Aldridge, Karlie Kloss, and Behati Prinsloo. All things considered, it was an impressive follow-up to Taylor's star-studded concert on Friday [8]. Keep reading for more pictures of Taylor's latest show, then get up to speed on her feuds, friendships, and flames [9].