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The 'Last Friday Night (TGIF)' singer looks set to play a granny in the music video for her next single 'The One That Got Away'.
Pictures of the 'Firework' singer sporting long grey hair, prosthetic face wrinkles and a long sleeved dress have surfaced on fansite KatyFan.com.
The track is the sixth single to be released from her double-platinum 'Teenage Dream' album.
Katy recently unveiled the artwork for the song, which saw the singer sporting violet hair and a disc-shaped hat.
So far the five singles already released from 'Teenage Dream' have all made the US Number One spot on the Billboard Hot 100, which matched a record previously set by Michael Jackson in 1987-88.
If she scores another Number One Katy will set a new record.
She has also had Vodafone Big Top 40 chart toppers with 'California Gurls' and 'Teenage Dream'.