Aww! Cameron and Ashton made an adorable -- and well-coiffed -- pair at the premiere of their movie, What Happens In Vegas. So what's their secret? Paul Mitchell's Tea Tree Styling Gel ($9.95, professional salons) and Tea Tree Styling Wax ($16.95): celeb stylist Robert Chiu treated the duo's hair with these products on the set of their Vegas comedy. Oh, and guess what? If you decide to purchase these items -- or any item from Paul Mitchell's Tea Tree collection for that matter -- you'll be helping American Forests, a non-profit that ensures trees are planted to offset all carbon emissions from the line's manufacture and distribution. So if you're in need of hair products and didn't do your green deed on Earth Day, now's your chance! Yaaay.