Before the interview began, Robert Downey Jr’s assistant had spent two hours fretting about getting the temperature in the room just right.

He needn’t have worried. For as the Hollywood star joined Lorraine Kelly in a hotel suite for a chat, there was just one thing on his mind.

Miss Kelly has revealed that as the 49-year-old actor sat down, he blurted out: ‘Nice t*ts.’

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ITV breakfast host Lorraine Kelly interviewing actor Robert Downey Junior for her show in a hotel suite

The ITV breakfast host, 54, who has a 36C bust, said: ‘Robert was not quite himself. He had a time in his life when maybe he was discovering himself, having issues.

‘He came on looking a bit worse for wear and he had no shoes on and he wandered around and he sat down and I said hello and he looked at me and said, “Nice t*ts”.

'It could have been worse. He could have said, “Oh, I don’t like them”. It is a difficult thing to respond to.’

Downey Jr’s comments were all the more surprising because Miss Kelly had been primed to think his first concern would be how hot it was.

Speaking on tomorrow night's Jonathan Ross Show, Miss Kelly explained that the actor greeted her by saying 'Nice t**s'

Speaking on tomorrow night’s Jonathan Ross Show on ITV, she said: ‘We were in a hotel room waiting for him and a minion came in and said the room was too hot.

'He kept coming back every ten minutes saying “The room is too hot. Robert won’t like it”.

'The man had a Robert Downey Jr thermometer.

‘Anyway, Robert came and he was fine. He didn’t know what they were talking about.’