Jack Osbourne has a huge tattoo on his back - which his mother Sharon Osbourne doesn't approve of.

Jack Osbourne's tattoo (c) Instagram

Jack Osbourne's tattoo (c) Instagram

The 30-year-old star - who has daughters Pearl, three, and Andie, nine months, with wife Lisa - showed off the inking of a Samurai warrior doing battle with a sea serpent while surrounded by mermaids and flowers on his Instagram account on Saturday (19.03.16), and suggested he had kept the artwork hidden for some time.

He captioned the image: "Here's something that most people don't know about me. Safe to say Mum wasn't thrilled at first #tattoos #backpiece."

Although Jack has only recently unveiled his tattoo, it's thought he has had parts of it for several years.

But fans are divided on it; as one wrote: "I'm not surprised she wasn't, it looks f***ing awful" and another wrote: "Sharon should have kicked your ass."

Whereas another follower said: "Wow that is a awsum back peice" (sic).

Jack's sister, 31-year-old Kelly Osbourne, previously admitted her famous family didn't approve of one of her tattoos either, the word 'Stories' etched on the side of her head.

At the time, Kelly said: "None of my family are happy with it, but that's OK, they are entitled to their opinion. All moms want their daughters to be perfect, having a tattoo on the side of your head and a mohawk isn't exactly every mother's dream and I can understand that."