Whether it's to prevent wrinkles or reduce their risk of skin cancer (or both), the following celebrities go to great lengths to protect their skin from the sun.

According to a three-year study by the University of Western Australia, tea tree oil has been found to be an effective alternative topical treatment for precancerous non-melanoma skin lesions and even has had success in shrinking tumors in mice.

Allergies are triggered by a variety of things that don't bother most of the population -- pet dander, dust mites, mold, insect stings and certain foods. However, it's also possible to have an allergy to UV light -- a sun allergy.

The American Cancer Society states that skin cancer is the most common type of cancer, with more than 1 million new cases diagnosed in the United States each year. Most skin cancers are caused by excessive exposure to the sun's UV rays.

Excessive sun exposure leads to an uneven complexion, lines, wrinkles and redness and is the fastest way to age your skin. Sun damage to the skin accumulates over time and can be caused by even a few minutes outdoors at a time.

Spending time in the sun is a regular pastime for people throughout the United States and much of the rest of the world.

Years of sun worship gave you a deep-golden tan that was the envy of island vacationers. The downside is that it also left you with spots, freckles and a crepey skin texture. This sun damage is often most noticeable on the chest and can really show your age.