Famously pitchy singers
The fact that Spears, 32, lip-syncs through most of her songs is hardly news. In fact, she has been caught mouthing to backing tracks during her residency at Las Vegas' Planet Hollywood Resort & Casino.
In July earlier this year, a leaked track of her singing her song Alien without Autotune made its rounds online. Suffice it to say that netizens were far from impressed.
Producer William Orbit defended her and said that she was "warming up".
This teen actress-turned-singer is not the best singer, and she proved this during her performance at the KIIS FM Jingle Ball last year.
Gomez, 22, audibly exclaimed "what the f***" before storming off stage after facing microphone and audio problems, revealing that she lip-synced throughout her set.
Even seven-time Grammy winners have their off days.
Swift, 24, suffered public shaming during the Grammys in 2010 when she warbled off-key through a duet with Fleetwood Mac's Stevie Nicks on the songs Rhiannon and You Belong With Me.
PHOTOS: AFP, REUTERS
Perry's live vocals have improved greatly over the years.
Still, the 29-year-old offered a "limp" performance of her hit Unconditionally during The X Factor UK finals last year.
It was a double blow, coming shortly after she was busted for lip-syncing at the NRJ Music Awards in Cannes the day before.