But on Tuesday Ozzy Osbourne looked like your average grandfather as he held his grandchild Pearl.
The rocker couldn't help but laugh as he spent time with his son Jack Osbourne and Lisa Stelly's gorgeous little girl.
Family time: Ozzy Osbourne looked delighted as he held his granddaughter Pearl
As he was: During his Black Sabbath days, Ozzy was nicknamed the 'Prince of Darkness'
While Ozzy, who is dressed all in back, is laughing, Pearl is seen looking up at her granddad with a cute and curious expression on her face.
The famous Osbourne family have clearly been making the most of the festive season, ensuring Pearl's first Christmas is a special one.
Adrenaline Junkie star Jack has really embraced fatherhood after his wife Lisa gave birth just over eight months ago.
On New Year's Eve he shared another picture of his little family alongside some friends.
He wrote: 'This is how you spend New Years when you have a baby. At home with the Wolfs. Pearl didn't make it Olive did.'
Jack and his wife Lisa were spotted picking up plenty of supplies a few days before Christmas.
This year marked the couple’s first Christmas together as a married couple following their Hawaiian wedding in October 2012.
Happy New Year: Jack shared a picture of himself on New Year's Eve with some friends
Jack told E! Online: 'The house is decorated to the nines.'
His wife added: 'We have two Christmas trees. Not one, but two! One fake, one real.'
First Christmas: It was Jack's first Christmas with his wife Lisa and their daughter Pearl
Something funny: Pearl was seen giggling as she went for a stroll with her dad ahead of Christmas
They also took Pearl to meet Santa Claus for the first time and shared the warming family snap on Twitter.
Lisa wrote: 'Pearl met Santa for the first time. She wasn't totally stoked on him but she managed to squeeze out a smirk for the camera....What a doll!' Xo Lisa O.'
Meeting Mr Claus: Jack and Lisa took their daughter to meet Santa Claus for the first time