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Demi Lovato is mourning the loss of her father.  The singer's older sister, Dallas Lovato, took to Twitter on Saturday to announce Patrick Lovato's passing.

In a message on the micro-blogging network, Lovato's mother, Dianna De La Garza, also thanked everyone for their "outpouring of love and prayers." 

According to the "New York Daily News," the "X Factor" judge had been estranged from her father for a number of years.  Their rocky relationship is even chronicled in Lovato's track "For the Love of a Daughter." 

The cause of death is not yet known, but Patrick Lovato had been suffering from cancer.  He was 53 years old.  

In light of her father's death, Demi Lovato has also received support from her "X factor" co-stars.  The show's creator Simon Cowell tweeted that his thoughts were with the singer, while host Mario Lopez also sent Lovato his support.  

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