KATY Perry looked unrecognizable in a throwback photo as the new mom returned to the American Idol set.
The singer stunned fans with the nostalgic picture which saw the star with shoulder-length black hair relaxing in a recording studio.
The Teenage Dream singer tagged Swedish record producer Max Martin who also featured in the throwback image.
He went on to explain: “This was taken during the recording of One [of] The Boys most probably in 2007 or early 2008 at Dr Luke’s studio flat in NYC when they were working and making magic on I Kissed A Girl and Hot N’ Cold.
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