The 1989 World Tour Guests (as of October 4th, 2015):
Alanis Morissette ("You Oughta Know")
Alison Krauss ("When You Say Nothing At All")
Andy Grammer ("Honey I'm Good")
Avril Lavigne ("Complicated")
Beck + St. Vincent ("Dreams" by Beck)
Charli XCX ("Boom Clap")
Dan Reynolds from Imagine Dragons ("Radioactive")
Dierks Bentley ("Every Mile A Memory")
Echosmith / Sydney Sierota ("Cool Kids" and "Cool Kids" again)
Ed Sheeran ("Tenerife Sea")
Fetty Wap ("Trap Queen")
Fifth Harmony ("Worth It")
Jason Derulo ("Want To Want Me")
John Legend ("All Of Me")
Justin Timberlake ("Mirrors")
Keith Urban ("John Cougar, John Deere, John 3:16" / "Somebody Like You")
Kelsey Ballerini ("Love Me Like You Mean It")
Leona Lewis ("Bleeding Love")
Lisa Kudrow ("Smelly Cat")
Little Big Town ("Pontoon")
Little Mix ("Black Magic")
Lorde ("Royals")
Mary J. Blige ("Doubt" and "Family Affair")
Mick Jagger ("(I Can't Get No) Satisfaction")
MKTO ("Classic")
Natalie Maines from The Dixie Chicks ("Goodbye Earl")
Nelly & HAIM ("The Fix" / "Hot In Herre")
Nick Jonas ("Jealous")
Nico & Vinz ("Am I Wrong)
OMI ("Cheerleader")
Rachel Platten ("Fight Song")
Ryan Tedder from OneRepublic ("Counting Stars")
Sam Hunt ("Take Your Time")
Selena Gomez ("Good For You")
Serayah ("Style")
Steven Tyler from Aerosmith ("I Dont Wanna Miss A Thing")
The Band Perry ("If I Die Young")
The Weeknd ("Can't Feel My Face")
Uzo Aduba ("White Horse")
Walk the Moon ("Shut Up And Dance")
Wiz Khalifa ("See You Again")
oops.. Well Demi slayed both those roles though
Yasss
