After a long battle with cancer that caused Ariana Grande to cancel her UK tour dates, Grandpa Grande has passed away. The singer posted a heartbreaking series of tweets announcing her grandfather's death, thanking her fans for their support and expressing her feelings about losing someone so important to her.

She said, "This is the hardest thing imaginable, but I'm so grateful that I got to spend time with him and my family, taking care of him and loving him."

Our thoughts go out to Ariana. Leave your supportive messages in the comments, and click through to see photos of Ariana with her grandfather!

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