"I feel so humbled to have had so much support from my fans, friends, family and complete strangers.. God bless you all, thank you so much," Lovato wrote on Twitter.
Lovato's parents divorced in 1994. She and her father had a rocky relationship since 2007 before he passed away over the weekend after reportedly losing battle against cancer.
The 20-year-old singer missed out a scheduled photoshoot for 'The X Factor' after the news broke out.