Leonardo DiCaprio should consider wearing something he won't mind getting slimed in on Saturday at the Nickelodeon Kids' Choice Awards in Los Angeles. Leo is set to be honored with the first-ever "Big Green Help Award," which will be presented to him by good pal Cameron Diaz. The award recognizes DiCaprio's dedication as an environmental activist, as well as his inspiring work, which includes directing and producing the award-winning environmental documentary The 11th Hour, reports People. Make sure to check out the Kids' Choice Awards live on Nickelodeon at 8 p.m. Et. to see if...

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