Peter posted the hilarious photo of himself on Twitter this morning (30 July) and it shows him rocking...well...a matted greasy bouffant.
The Australian singer is staring at the camera in a seductive manner (we guess), and is showing off his biceps in a white muscle vest.
Sharing the snap, which we imagine was taken just prior to his 'Mysterious Girl' heydays, Peter said: "Greetings from planet strange :))."
Now aged 41, dad-of-three Peter has a much more clean-cut look and prefers to cover up his once-famed six pack with a smart shirt.
We wonder what his fiancée Emily MacDonagh makes of this little gem?!
Peter and Emily welcomed their first baby together, Amelia, in January. See who else has given birth this year here:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe