Having accepted the kindly invitation, and upon viewing Herring's page, joy turned to confusion when presented with a picture of mobile phone-hollering comedian Dom Joly.
Now, Diary has never seen the two in the same place and so thought it prudent to ask whether Herring was, in fact, the lumpy prankster's alter ego.
'Having become increasingly bored with being "recognised" at media events with the line "You're really funny, can you do that phone joke thing", I have adopted his photo to confuse people even more,' revealed Herring.
'This dates back to a BBC3 launch party where a journalist from The Sunday Times spent ten minutes pleading with me for an interview.'
Herring is not the only PR industry lookalike. Some PRWeek staffers swear that Golin Harris co-MD Jonathan Hughes bears a striking resemblance to Tory MP Ed Vaizey. Any other PR lookalikes? Email us...