Jack Whitehall was left slightly red-faced with his father's intimate revelations on their new TV show, Backchat.
The Fresh Meat star was embarrassed when his dad Michael admitted the size of his manhood gave him problems with underwear, during an interview with guest Newsnight frontman Jeremy Paxman.
During the episode, the discussion turned to underwear and Jeremy complained about holes in his undergarments.
Michael then revealed: "The problem I have is the elastic. I shouldn't say this in front of you [Jack], but I'm very well hung.
"I need very strong elasticity in an underpant. Once it starts loosening up, all hell breaks loose," he continued.
He then added: "Jack has inherited some very good things from me, and that is one of them."
Jeremy and Danny Dyer were the first guests on the new chat show, which mixes interviews with comedy sketches.
Backchat With Jack Whitehall And His Dad continues on BBC Three on Wednesdays.
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