Taylor Swift's '1989' Tour Guest Stars: Where the Singer's 78 BFFs Rank on a High-School Clique Scale

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Taylor Swift's blockbuster 53-city worldwide trek featured star cameos nearly every night. As pop music's reigning class president, here's how her 78(!) BFFs fit in among the usual high school cliques.

1. Julia Roberts (Aug. 15, Santa Clara, Calif.); 2. Idina Menzel (Oct. 31, Tampa, Fla.); 3. Lena Dunham (July 10, East Rutherford, N.J.); 4. Uzo Aduba (July 11, East Rutherford, N.J.; Aug. 22, Los Angeles); 5. Serayah McNeill (July 18, Chicago); 6. Lisa Kudrow (Aug. 26, Los Angeles); 7. Matt LeBlanc (Aug. 22, Los Angeles); 8. Mariska Hargitay (June 12, Philadelphia)

9. Ellen DeGeneres (Aug. 24, Los Angeles); 10. Chris Rock (Aug. 22, Los Angeles)

11. Mick Jagger (Sept. 26, Nashville); 12. Steven Tyler (Sept. 25, Nashville); 13. Joan Baez (Aug. 15, Santa Clara, Calif.); 14. Alanis Morissette (Aug. 24, Los Angeles); 15. Mary J. Blige (Aug. 22, Los Angeles)

16. Ricky Martin (Oct. 27, Miami); 17. Nick Jonas (July 11, East Rutherford, N.J.); 18. Jason Derulo (July 14, Washington, D.C.); 19. Nelly (Sept. 29, St. Louis); 20. Justin Timberlake (Aug. 26, Los Angeles); 21. John Legend (Aug. 25, Los Angeles); 22. Pitbull (Oct. 27, Miami)

23. Lily Aldridge (July 10-11, East Rutherford, N.J.); 24. Lorde (July 13, Washington, D.C.) 25. Hailee Steinfeld(July 10, East Rutherford, N.J.); 26. Haim (Sept. 29, St. Louis); 27. Karlie Kloss (June 27, London); 28. Ellie Goulding (Oct. 17, Arlington, Texas); 29. Gigi Hadid (June 27, London; July 10, East Rutherford, N.J.); 30. Cara Delevingne (June 12, Philadelphia; June 27, London); 31. Selena Gomez (Aug. 26, Los Angeles)

32. Abby Wambach and the (33, 34) U.S. Women's Soccer Team (July 10, East Rutherford, N.J.); 35. Serena Williams (June 27, London); 36. Russell Wilson (Aug. 8, Seattle); 37. Kobe Bryant (Aug. 21, Los Angeles); 38. Dwyane Wade (Oct. 27, Miami)

39. Kelsea Ballerini (Sept. 25, Nashville); 40. Dierks Bentley (Sept. 21, Kansas City, Mo.); 41. Alison Krauss (Sept. 25, Nashville); 42. Keith Urban (Oct. 2, Toronto); 43. Little Big Town (June 5, Pittsburgh); 44. Miranda Lambert (Oct. 21, Greensboro, N.C.); 45. The Band Perry (Sept. 16, Indianapolis); 46. Natalie Maines (Aug. 24, Los Angeles); 47. Sam Hunt (July 19, Chicago)

48. Charli XCX (Oct. 3, Toronto); 49. The Weeknd (July 10, East Rutherford, N.J.); 50. Tove Lo (Oct. 24, Atlanta); 51. Wiz Khalifa (Sept. 9, Houston)

52. MKTO (July 25, Foxborough, Mass.); 53. Fetty Wap (Aug. 8, Seattle); 54. Sydney Sierota (Sept. 18, Columbus, Ohio) and Echosmith (July 12, Philadelphia); 55. Alessia Cara (Oct. 31, Tampa, Fla.); 56. Shawn Mendes (Aug. 8, Seattle); 57. Rachel Platten (June 13, Philadelphia)

58. Fifth Harmony (Aug. 14, Santa Clara, Calif.); 59. Ciara (Aug. 8, Seattle); 60. Little Mix (Aug. 15, Santa Clara, Calif.)

61. OMI (Aug. 29, San Diego); 62. Avril Lavigne (Aug. 29, San Diego); 63. Leona Lewis (Sept. 26, Nashville); 64. Nico & Vinz (Aug. 1, Vancouver)

65. Walk the Moon (July 24, Foxborough, Mass.); 66. Imagine Dragons' Dan Reynolds (May 30, Detroit); 67. Beck (Aug. 25, Los Angeles); 68. Andy Grammer (July 18, Chicago); 69. Ryan Tedder (Aug. 21, Los Angeles); 70. St. Vincent (Aug. 25, Los Angeles)

71. Martha Hunt (June 27, London); 72. Sean O'Pry (Aug. 22, Los Angeles); 73. Behati Prinsloo Levine (July 11, East Rutherford, N.J.); 74. Kendall Jenner (June 27, London); 75. Heidi Klum (July 10, East Rutherford, N.J.); 76. Candice Swanepoel (July 11, East Rutherford, N.J.) 77. Andreja Pejic (July 19, Chicago); 78. Lily Donaldson (July 19, Chicago)

Swift: Cooper Neill/Getty Images. Background: Getty Images. 1: Jeffrey Mayer/WireImage. 2,12,40,42: Michael Loccisano/Getty Images. 3: Jesse Grant/Getty Images. 4: Brad Barket/Getty Images. 5: Gilbert Carrasquillo/FilmMagic. 6,39,43,74: Jon Kopaloff/FilmMagic. 7,17,21: Steve Granitz/WireImage. 8: Bruce Glikas/FilmMagic. 9,36,38,46: Jason LaVeris/FilmMagic. 10: Don Arnold/WireImage. 11,41: Jason Merritt/Getty Images. 13: Jeffrey Ufberg/WireImage. 14:Ernesto Distefano/Getty Images. 15: Tabatha Fireman/Getty Images. 16: Alexander Tamargo/Getty Images. 18: Chelsea Lauren/Getty Images. 19: Gary Gershoff/WireImage. 20: Taylor Hill/FilmMagic. 22: Cindy Ord/Getty Images. 23: Amanda Edwards/WireImage. 24: Gabriel Olsen/FilmMagic. 25: Manny Carabel/FilmMagic. 26: Stefanie Keenan/Getty Images. 27: Grant Lamos IV/FilmMagic. 28: Michael Stewart/FilmMagic. 29: Jamie McCarthy/Getty Images. 30: David M. Benett/Getty Images. 31: Gilbert Carrasquillo/FilmMagic. 32: Mark Cunningham/Getty Images. 33: Rich Lam/Getty Images. 34: Harry How/Getty Images. 35: Karwai Tang/WireImage. 37: Andrew D. Bernstein/NBAE/Getty Images. 44,57,67: Taylor Hill/Getty Images. 45: Robert Altman/Invision/AP Images. 47: Frederick Breedon/FilmMagic. 48: Dave Hogan/MTV 2015/Getty Images. 49: Kevin Kane/FilmMagic. 50: Rex Features/AP Images. 51: C Flanigan/FilmMagic. 52: Ilya S. Savenok/Getty Images. 53: Gustavo Caballero/Getty Images. 54: Ethan Miller/Getty Images. 55: Amanda Edwards/WireImage. 56: George Pimentel/WireImage. 58: Rich Polk/Getty Images. 59: Evan Agostini/Invision/AP Images. 60: Brian Rasic/WireImage. 61: Karwai Tang/WireImage. 62: Denise Truscello/WireImage. 63: Paul Redmond/Getty Images. 64: Bill McCay/Getty Images. 65: Jeffery Mayer/WireImage. 66: Frank Hoensch/Redferns/Getty Images. 68: RB/Bauer-Griffin/GC Images/Getty Images. 69: Frederick M. Brown/NBC/NBC/Getty Images. 70: Mike Marsland/WireImage. 71: Dimitrios Kambouris/Getty Images. 72: Venturelli/Getty Images. 73: Andrew Toth/FilmMagic. 75: Bryan Bedder/Getty Images. 76: Michael Stewart/WireImage. 77: Slaven Vlasic/Getty Images. 78: Jim Spellman/WireImage

Billboard Year in Music 2015

This story originally appeared in the Dec. 19 issue of Billboard.