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On hand to introduce her new film Smurfs: The Lost Village, Lovato went green, not blue, when surprisingly hit with the slimy stuff.
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More into the experience? Triple winner Hart, who told the crowd, "I have waited my whole life to get slimed."
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THE POWER RANGERS
Not even this crew's skills could save them from the green goo.
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Considering it's pretty much tradition to slime the host, we're going to guess the WWE star saw this one coming.