Hawaiian crooner Bruno Mars, who's up for six GRAMMYs this Sunday, has a ton of dedicated fans, but Daniella Macolino might be the most dedicated of them all. The 19-year-old suffers from a rare blood disease requiring frequent hospital visits and has used Mars' "Grenade" as a way to deal with the situation. Watch her deliver a heartwrenching personal thank you to Mars in this Grammy Thank You video, and if you have any nominees to thank, drop 'em in the comments.

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