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Oscar winning actress Helen Mirren says the secret to her youthful look is just being happy.

Mirren, who won an Oscar for her performance in "The Queen", reveals that the formula for her unconventional beauty is living a healthy life.  

Contactmusic.com quoted her as saying: "I'm quite a happy person. I always have been. My tendency is to smile." 

But, Mirren has some health concerns.

She adds: "I don't drink enough water. I don't do enough exercise. I eat fairly healthily but not that healthily, as everyone who saw me munching into a burger will know. It was my first for four years. I don't eat burgers regularly. I don't think people should."