Okay, list of celebs that attended Britney: Piece of Me:
- Katy Perry
- Miley Cyrus
- Sia
- Jamie Lynn Spears
- Mario Lopez
- Adam Lambert
- Lance Bass
- Nicki Hilton
- Paris Hilton
- Bonnie McKee
- Paula Abdul
- Lady Gaga
- Jesse Tyler Ferguson (Modern Family)
- Nicole Richie
- Fergie
- Jay Sean
- Christina Perri
- Anna Kendrick (Pitch Perfect)
- Brittany Snow (Pitch Perfect)
- Kelley Jackle (Pitch Perfect)
- DJ Pauly D
- Tyra Banks
- Dakota Fanning
- Haylie Duff
- G.R.L. (w/ Simone
)
- Karen Gillan & Rose Mclver
- Dolph Ziggler
- Priyanka Chopra
- Shania Twain
- Jessica Alba
- Lucy Hale
- Delta Goodrem (Australia singer)
- Luaren Conrad
- Kellan Lutz
- Vanessa Hudgens
- Ashley Tisdale
- Big Kenny (and his wife) from Big and Rich
- Robert Herjavec from Shark Tank
- Harry Anderson from Night Court (show in the '80s - '90s)
- David Bromstad from HGTV
- Mark Ballas (Dancing with the Stars)
- Kym Johnson (Dancing with the Stars)
- Georgia May Jagger (Mick Jagger's daughter)
- Nick Jonas
- Kathy Griffin
- Kelly Kelly
- Maryse
- Jennifer Lopez
- Kristen Cavallari
- Selena Gomez
- Grace Helbig (Youtube Star)
- Kelly Clarkson
- Arnold Schwarzenegger
- Patrick Schwarzenegger
- Sofía Vergara
- Joe Manganiello
- Ashley Benson
- Holly Madison
- Joey Graceffa (Youtuber)
- Steve Aoki (DJ)
- Chloe Grace Moretz
- Adrienne Bailon
- Melissa Joan Hart
- Steven Tyler
- Tori Kelly
- Gigi Gorgeous (Youtuber)
- Trisha Paytas (Youtuber)
- Collen Ballinger (Miranda Sings)
- Calvin Harris
- Jussie Smollett
- Florida Georgia Line
- Skrillex
- Jeremy Scott
- Neil Patrick Harris
- Marina & The Diamonds
- Ruby Rose
- Tiesto
- Lionel Richie
- Frankie Grande
- Beyoncé Knowles-Carter
- Jay Z
- Dave Chappelle
- Dave Grohl
- Duncan James
- RuPaul
- Michelle Visage
- Tamar Braxton
- Avril Lavigne
- Kingsley (Youtuber)
- 5th Harmony
- Ke$ha
- Shane Dawson (Youtuber)
- Hailee Steinfeld
- Pouya
- Nicolas Cage
- Colton Haynes
- Tinashe
- Charli XCX
Anymore I need to add?
I need a video!!! 
Is there any pic of Nick Jonas from yesterday show??
so the 140 shows in 2 years seems to be true so far confirmed 114 until September 2015