Jennifer Aniston surprised Horrible Bosses co-star

Jennifer Aniston surprised her 'Horrible Bosses' co-star Charlie Day with her convincing performance as a sexually-aggressive dentist in the movie.

Jennifer Aniston shocked co-star Charlie Day with her performance in 'Horrible Bosses'.

The actress stars in the movie as a sexually-aggressive dentist and the actor - who plays Dale, an employee the subject of Jennifer's character's advances - admits he was astonished at how convincing she was in the role, but thinks his disbelief was good for the movie.

He said: "I think people will get a kick out of seeing her play a character who's as far from safe as you can get, or tame, she plays it so well. I was shocked, but I have to be in the role."

While Charlie enjoyed his role in the film as one of three friends who plot to kill their nightmare employers, he admits some of the best scenes went to the bosses, portrayed by Jennifer, Colin Farrell and Kevin Spacey because their antics were so outrageous.

He added: "Jennifer fully embraced the part, as Colin Farrell and Kevin Spacey did. We couldn't have got a better cast. The bosses, in some sense, they have the most fun stuff to do in the movie, they get to be outrageous and awful people, which is sometimes a lot of fun to play."