The 65-year-old, wearing aviator-style glasses and helmet hair, looked almost identical to the singer who died suddenly from a heart attack in 1988.
"He was and always will be one of the greats of rock 'n roll." McCartney said of the Texan whose hits include 'You Got It' and 'Crying'.
Paul has remained friends with Orbison's widow Barbara and she was among the special guests at his concert at the Amoeba Record store in Los Angeles, California last year.
Earlier this week McCartney dismmed reports that he had a heart procedure last year as "entirely untrue."
"People are ringing and texting me saying, 'Are you OK?"' he writes in a posting on his newly redesigned Web site.
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