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16 November 2011, 09:41 | Updated: 16 November 2011, 09:44
The 'Teenage Dream' star was trying to fool fans with a version of Jay-Z's 'Big Pimpin'.
Katy Perry has been caught out miming playing the recorder at a gig in America.
The 'Teenage Dream' singer was attempting to play along to Jay-Z's 'Big Pimpin' when she moved the recorder away from her mouth but the instrument continued to make noise.
An embarrassed Katy then pretended to cry and told the crowd: "So I learnt that I can't play the flute."
However, the star has since revealed that she was in on the joke.
In a message on Twitter, she wrote: "P.s. Fail to all of you who fell for my scripted flute joke #Iminonthejokebooya."
Katy is currently coming to the conclusion of the final US leg of her 'California Dreams' world tour, which has been in support of her second album 'Teenage Dream'.
Watch the video of Katy Perry playing the recorder below.