When she replied, "Not much", he said: "Not much, except there's something going on underneath".

As stunned fans looked on, the presenter cupped the star's breast in one hand and said: "It's built in, I just wanna feel it - oh, I just love that."

When Scarlett asked what he was doing, Mizrahi joked: "I'm just taking notes."

The 21-year-old actress said: "Well, take all the notes you want."

Earlier this month, it was revealed Scarlett banned Match Point co-star Jonathan Rhys-Meyers from looking at her breasts while filming sex scenes.

The stunning blonde told the handsome actor to stop leering at her curves while they filmed the raunchy romps - but he says he peeped anyway.

He told US TV show Unscripted: "I remember Scarlett telling me not to look at her t**s. But I did sneak a peek - I couldn't help it, they were in my face."