The 'Far from the Madding Crowd' star said she prefers to sport loose-fitting dresses on the red carpet as she feels uncomfortable when she shows off too much of her slender physique, reported Femalefirst.
"I'm so reserved. I like outfits that come to my knee and aren't too tight or revealing. I'm too self conscious of my body and my appearance," she said.
The brunette beauty, 29 - who is married to "Mumford and Sons" star Marcus Mumford - added she hates having her picture taken at high profile events.