Robson, 52 – who was on today's This Morning to speak about his show Robson Green: Grand Slam Fishing on the Travel Channel – was quick to bring up his Grantchester co-star; who Holly clearly has the hots for.
Robson said: "You really like James don't you Holly?" to which she replied: "I think he's a very talented actor."
The actor continued to say: "Holly's got a list. I'm not on it. Surprise surprise," he added with a sly grin on his face.
A beaming Holly then shared: "I do have a little list. He's very versatile as an actor."
The beauty then begged: "Don't do this," while Phillip Schofield chuckled beside her.
Robson Green joked about Holly Willoughby's 'list'
Robson chatted to Holly and Phillip on today's This Morning
Holly's got a list. I'm not on it. Surprise surprise!
Robson eventually claimed: "It's ok, I admire your taste in men."
Holly wasn't the only one to dish the dirt on one of her secrets during today's interview, with Robson also getting a bit of gossip out of Phillip.
Holly asked her co-presenter: "You like a bit of fishing, don't you? If you ever wondered what Phillip Schofield watches on late night television."
He then replied: "I'm quite secretive about it. I love extreme fishing shows."
Robson continued to tell him: "Who could resist the mixture of exotic travel and fishing? We fake sincerity as an actor, but when I'm casting a line I'm genuinely happy. Absolute clarity."
This Morning: The funniest moments
Mon, December 12, 2016
This Morning: Laughter, tears and nudity, the most outrageous moments from the ITV show.
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This Morning was thrown into chaos as Holly Willoughby and Gino D'Acampo took on the Christmas cocktail challenge
Robson said he 'wasn't on Holly's list'
Holly went red-faced when she was asked about her crush on James Norton
Despite Robson gaining an army of fans over the years, the majority of viewers weren't so impressed with his change in accent when he was interviewed on the ITV talk show earlier today.
One person posted: "#ThisMorning why is #RobsonGreen talking like he's got plumbs in his mouth??? He's a GEORDIE!!" as a second added: "I remember Robson Green when he still had a lovely and warm Geordie accent."
A third continued: "Wait….why is Robson Green sounding so different?…..from Geordie to Luvvie #thismorning."
This Morning airs weekdays at 10.30am on ITV.