The 58-year-old has now put a price on his conversations with loyal viewers.
Fans of Doctor Who, Torchwood and Dancing on Ice will need to cough up their coin to interact with Barrowman at his latest public appearance.
The star is set to appear alongside huge names such as Mel Gibson, Brian Blessed and Craig Charles at a weekend of TV and film celebrations.
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The London Film and Comic Con will take place at the Olympia, West Kensington, London, as reported by What’s The Jam.

A multitude of stars will feature across the two day event (5 Jul to 6 Jul).
Hollywood icon Mel Gibson is the biggest name on the list, who despite charging £200 for a ‘Mad Max photoshoot’ is not charging guests for a chat.
Fans wanting to simply chat to Barrowman will have to fork out £10 for the privilege.
For £60, sci-fi lovers will be able to have a photoshoot with the 58-year-old in his on screen used Captain Jack coat from the Doctor Who and Torchwood series.
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Whilst a standard photo and autograph will set you back £50 each.
A spokesperson for London Film and Comic Con stated: “John Barrowman is joining us for London Film & Comic Con.
“John is best known as Captain Jack Harkness in Doctor Who and its spin off Torchwood and as Malcolm Merlyn/Dark Archer in the Arrowverse.
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“He’s also appeared in Zero Dark Thirty, Scandal and Desperate Housewives.
”Members of the public applauded the actor’s appearance at the event.
Gary Gillespie said: “Great to see the Captain back.

”Michael Gunn added: “Barrowman is the best love the guy.
”Jayne Herriman said: “He is fabulous.”
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