Kelly Osbourne thinks her parents are the "definition of true love".
Writing on her twitter page, she said: "happy anniversary mum and dad! you are the definition of true love! @MrsSOsbourne @OfficialOzzy. 30 years of true love! (sic)"
However, Kelly didn't take too kindly to the comments of one fan, who suggested Sharon and Ozzy's relationship was "f****d up" referring to an incident in 1989 when the former Black Sabbath rocker reportedly attempted to strangle his wife.
He tweeted: "@MissKellyO Didn't your Dad strangle your Mum unconcious? f****d up love if you ask me. (sic)"
To which Kelly replied: "go and f**k yourself with a hedgehog! (sic)"
Sharon recently revealed she was so shocked to receive sexy text messages from her husband, she was convinced a thief had stolen his mobile phone.
She said: "I got a text from Ozzy yesterday and I'm like, 'Jesus, somebody's stolen his phone.' Because I thought somebody found his phone and they were texting me dirty messages.
"And Silvana, my assistant, goes, 'Oh my god, Ozzy's just sent you this really dirty text.' And I'm like, 'Well it's not him, somebody must have stolen his phone, he can't text'. But it was him."