Her Big Bang Theory character Penny is hardly renowned for being at the cutting edge of fashion.

However, Kaley Cuoco looked like a Hollywood glamour puss after donning a striking white dress for an appearance on Late Night with David Letterman in New York on Monday.

The 26-year-old gave fans a cheeky smile as she pulled out the skirt of the crumpled silk number as she got a rapturous reception from fans outside the studio.