Former Game Of Thrones star Richard Madden has issued a career warning to model-turned-actress Cara Delevingne after she snapped at TV hosts during a now-infamous interview earlier this summer (15).

The usually-energetic runway beauty hit headlines in July (15) when she appeared via satellite on Good Day Sacramento and appeared to answer questions about her movie Paper Towns in a tired and sarcastic manner.

The interview got off to a bad start when one of the reporters carelessly introduced Delevingne as 'Carla', and when she was asked if she had read the Paper Towns novel, Delevingne replied, "No, I never read the book, or the script actually. I kind of winged it... no, of course, I love the book."

A male co-presenter later took Delevingne to task over her apparent attitude and the chat was cut short after the female anchor added, "You seem a bit irritated, perhaps it's just us", to which the Brit fired back, "Yeah, I think it's just you."

The model later blamed the awkward exchange on a cultural divide, stating, "Some people just don't understand sarcasm or the British sense of humour."

Fans were split over the controversy, but now Madden has advised the 23 year old to rethink her approach to promotional interviews if she plans to build on her acting resume.

The fellow Brit tells Eonline.com, "It was unprofessional. It made her seem ungrateful. She showed her age.

"For Cinderella, I did six weeks of those interviews, where you get asked the same eight questions. If you're not capable of doing it gracefully, then don't do it."