Adam Levine is "devastated and heartbroken" by Christina Grimmie's death.

Adam Levine and Christina Grimmie [Instagram]

Adam Levine and Christina Grimmie [Instagram]

The Maroon 5 frontman was Christina's coach on the sixth season of 'The Voice USA' and after she was shot dead by a 21-year-old man following her concert performance in Orlando on Friday (10.06.16) he called her death a "senseless act of extreme violence".

In a statement on behalf of himself and his wife Behati Prinsloo, Adam wrote on his band's Facebook page: "Behati and I are absolutely devastated and heartbroken by Christina Grimmie's tragic death. Our hearts go out to her family.

"Christina was a natural, a gifted talent that comes along so rarely. She was taken from us too soon. This is yet another senseless act of extreme violence. I am left stunned and confused how these things can conceivably continue to happen in our world."

He also added a sweet picture of him and Christina pulling funny faces.

Adam wasn't the only 'Voice' star to pay tribute to Christina, 22, following her shock death, with his fellow coaches taking to Twitter.

Blake Shelton wrote: "I'm stunned and disgusted and heartbroken that we lost that sweet little girl... Keeping @TheRealGrimmie family in my heart and mind," while Christina Aguilera tweeted: "So sad passing of @TheRealGrimmie. Beautiful member of #TheVoice family & true #Fighter. My heart goes out to her family, friends & fans. xo."

Pharrell Williams tweeted: "This is a tragic loss. My heart goes out to @therealgrimmie's family, friends and all the people that she touched" and Usher wrote: "To an amazing soul and voice...may your legacy live on forever. Rest in peace beautiful, Christina."

NBC's 'The Voice' changed its Twitter profile picture to a black square and tweeted: "There are no words. We lost a beautiful soul with an amazing voice. Our hearts go out to the friends, fans and family of @TheRealGrimmie."

Selena Gomez was among the many stars who paid tribute to Christina on social media, sharing a silly picture of them together with the words: "My heart is absolutely broken. I miss you Christina."

And her stepfather Brian Teefey set up a GoFundMe page to help Christina's family with the page raising over $20,000 in just a few hours.

He wrote: "Words cannot begin to describe the pain I am feeling. I learned this business through the eyes of a father and Christina was like a second daughter to me. All I wanted to do was assist her in achieving her musical dreams while protecting her from the pitfalls associated with the business. I never could have imagined this horrific event being one of the pitfalls needing to be avoided. In Christina's honor I have created a Go Fund Me page to assist her family in their time of need. As family Mother, Father, and Brother made the ultimate family sacrifice to support Christina on her musical journey. They did nothing but love her and support her as family the best they knew how, the only worry I want them to have at this point is that of recovery.

"Grimms I love you, and miss you beyond comprehension. - Brian Teefey, LH7 Management (sic)."

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