The world has been in mourning since Friday night when Christina Grimmie was tragically shot and killed while signing autographs after her show in Orlando, FL. The 22-year-old's vivacious spirit and incredible voice touched the lives of so many people, even those she never met.

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Both her close celebrity friends and stars who never had the chance to meet her took to Twitter upon finding out the news and paid tribute to the The Voice contestant.

Click through the gallery to see what celebs have been writing in Christina's memory.

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