Demi Lovato had to miss a photo shoot for The X Factor on Saturday after her biological father Patrick passed away.

No official statement from Demi yet – but her older sister Dallas tweeted, “Rest in peace daddy. I love you…”

Patrick had been estranged from both his daughters for over a decade – after he left the family when Demi was a toddler.

The cause of death is still unknown, but Patrick had battled cancer in recent years.

Our thoughts and prayers are with Demi and her family.