Singer Demi Lovato has cancelled an appearance at a publicity event for America's The X Factor following the death of her father.

The sad news was revealed by the singer's sister Dallas on Saturday (22Jun13), when she wrote in a post on, "Rest in peace daddy I love you."

No more details about Patrick Lovato's death were available as Wenn went to press. He was a former country singer and studio engineer and was believed to have been battling cancer in recent years.

Lovato's parents divorced in 1994 and she has been estranged from her dad since 2007.

After news of Patrick's death broke, Demi's mother Dianna, published a picture of him with the singer and her sister on her page, adding, "Thank you all for the outpouring of love and prayers. Y'all are amazing!"

Lovato was reportedly due to attend a photoshoot with her fellow The X Factor judges on Saturday, but pulled out of the event.

The show's host, Mario Lopez, revealed her absence by posting a picture of the remaining judges on his page, writing, "With my The X Factor Usa team! Missing (Demi Lovato) today... :("