Kelly Osbourne shared a sweet tribute to her father Ozzy Osbourne on the occasion fo his 72nd birthday.
The second of the three children he shares with wife Sharon Osbourne posted four throwback photos of her as a tot with her "hero" dad to Instagram on Thursday.
"Happy birthday Dadda!!!!! I watch you every day overcome the hugest obstacles," Kelly, 36, wrote. "Through all of this you have become an even better father to me and husband to mum.
"We are so lucky to have you. To see how far you have come in the last year is insane. YOU ARE MY HERO. You are the real iron man. I love you dadda. I’m so proud to be your daughter 💜."
This year saw the Black Sabbath rocker reveal he had been diagnosed with Parkinson's disease, sharing he discovered he had the neurodegenerative disorder after a fall.
The singer is also parent to son Jack, 35, and daughter Aimee, 37, from his marriage to second wife Sharon, 68.
Watch: Sharon Osbourne tearfully discusses Ozzy’s Parkinson’s diagnosis
Ozzy wed first wife Thelma Riley in 1971 with the marriage producing two children, daughter Jessica, 48, and son Louis, 45.
Although known for his wild parting antics and outlandish behaviour in the past, he recently said that cheating on Sharon was one of his biggest regrets.
In 2016, it was revealed that he'd been unfaithful to his wife with hair colourist Michelle Pugh which saw him and Sharon briefly split.
"I've done some pretty outrageous things in my life. I regret cheating on my wife. I don't do it anymore," Ozzy told GQ.
"I got my reality check and I'm lucky she didn’t leave me. I'm not proud of that. I was pissed off with myself. But I broke her heart."
Watch: Kelly Osbourne reveals 85 pound weight loss