Lindsay Lohan has revealed what makes her truly happy - sitting down.The 'Mean Girls' star - who also said looking at trees was "fun" - came out with the bizarre statement during a recent interview.She explained to In Style magazine: "I'm happiest when I'm just sitting. "I recently went to a redwood forest with a friend and went on a hike. It was the most fun I've ever had." Lindsay, who is renowned for her partying lifestyle, also revealed that she knows she needs balance in her life.She said: "I learned to have a lot of responsibilities at a very young age, whether in my personal life at home with my family or simply having to be on set. "I work longer hours than my friends' parents do."

Lindsay - who recently turned 20 - also thinks she knows what the "perfect age" is.

She mused: "It would have to be 40. You're at your most confident and you know how to take care of your body."

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