Los Angeles, Mar 25 (IANS): Model-turned-actress Cara Delevingne felt awkward when she was forced to talk about having sex on a plane, in front of her father Charles Delevingne on "The Graham Norton Show".

While Delevingne among other guests were chatting on varied topics on the show on Friday, it all went down when host Graham Norton decided to repeat something that Delevingne said to him privately backstage, reports dailymail.co.uk.

"I think your embarrassment threshold is quite high," Norton said to Delevingne, who asked him "Why?" with a concerned look on her face.

"Well we were talking about having sex on a plane," Norton said.

To that, Delevingne: "As have you."

Norton then admitted he has indeed had sex on a plane, at which point TV presenter Jonathan Ross, who accompanied Delevingne, remarked that "it doesn't count if it's with yourself!"

Norton then turned back on Delevingne: "You were doing it, and a man was watching it..."

Later Delevingne said: "My father is here by the way, sorry dad..."

It didn't stop here as Norton went on to add: "I was worried where that anecdote was going then. So you were having sex on a plane and someone was watching you."

Feeling awkward by his questions, Delevingne stumbled over her words and said: "I don't even know how to start this story."