Kate and Gerry McCann have hit back at Marco Pierre White Junior after the reality TV star launched a foul-mouthed attack on them on Twitter.
The parents of Madeleine McCann, who went missing in Portugal in 2007, said the abuse was 'entirely unjustified'.
The model, 22, son of celebrity chef Marco Pierre White, accused the McCanns of murdering their daughter and making money from her disappearance.
Kate and Gerry McCann have hit back at Marco Pierre White Junior's Twitter attack on them
Marco Pierre White Junior launched his attack on the McCanns on Thursday
He wrote: 'Kate and Gerry MacCann are f*****g guilty sick mother f*****s defiantly killed there daughter [sic]. Look at money they've made out of it in 10 years.'
The vile rant, littered with spelling mistakes, was posted to 40,000 Twitter followers.
Spokesman for the McCann's, Clarence Mitchell told The Sun the couple hope 'any right minded person will see his totally ignorant abuse for what it is'.
He added that they 'will not be dignifying his abuse with any further comment'.
Madeleine McCann went missing in 2007 on a family holiday in Portugal
The Big Brother star's outburst comes as heart doctor, Gerry, 49, and former GP, Kate, 48, from Rothley, Leicestershire, approach the tenth anniversary of their daughter's disappearance.
His comments could be deemed 'malicious and libelous', leaving him potentially open to legal action.
A source close to the McCann's told The Sun: 'He comes across as a complete and utter idiot. His father must be appalled by his behaviour.
The tweets sent out by Pierre White Jr are littered with spelling mistakes and explicit language
'But even mentioning him and like-minded people might give them some sort of spurious credibility.'
Madeleine vanished while the family were on holiday in Praia da Luz in May 2007. She had been left in a holiday apartment while her parents had dinner in a nearby tapas bar.
The couple still hope their daughter could still be alive and millions of pounds has been spent on investigating her disappearance.