Heather Graham thinks Las Vegas is "phony."

The 43-year-old actress returned to the gambling capital in the Nevada desert to film the third installment of The Hangover, but finds it too superficial for her taste: "I don't like Las Vegas. People seem phony, they're spending all their money and it's sad. And it's also so cold with permanent air conditioning everywhere. I'm more the type who wants to be outside and look at a tree. I don't want to look at a machine."

Although she didn't enjoy the location, Heather especially liked the luxury trailers she and her co-stars - Zach Galifianakis, Bradley Cooper and Ed Helms - stayed in during filming. When asked what was different this time round, she replied, "Well, we had much nicer trailers, they're gorgeous, you can live in there, they're so nice! And Zach has gone on a total health kick, he's Mr Healthy, he's observing this really strict diet. He's this crazy comedian, but now he's super health-conscious, he doesn't eat sugar or gluten."

The film hits theaters May 24.