The actress - who measures in at a mere 5 ft 4ins - gets constantly teased for being short but insists she is taller than most people think.

She said: "My friends call me hobbit. I come across shorter than I am. People will say, 'You're not five foot four.' And I'll say, 'People, I know my height.' I'm constantly winning bets - hundreds of dollars."

Hobbits are the diminutive characters from the 'Lord of the Rings' books and films.

Mila - who voices the character Meg Griffin in animated TV series 'Family Guy' - has also denied claims she has had plastic surgery, insisting if she were to go under the knife she wouldn't be embarrassed to admit it.

She added in an interview with the June issue of Esquire magazine, out this week: "Where are my boobs? If I were going to get plastic surgery, I'd get some real work done."

The 26-year-old star is slowly becoming aware of the internet phenomenon of "Meg porn" - which depicts the cartoon character in various compromising positions.

The 'Forgetting Sarah Marshall' actress said: "I was at the Emmys last year, and I was in a really ladylike dress, and I felt like a lady, and I opened my phone and someone had sent me these pictures of Meg getting it on with the dog. That was my introduction to Meg porn."