Sharon Osbourne, who recently quit reality show X Factor, has hit out at the wave of talent shows, insisting they are “train wrecks”.

The former reality TV star is convinced television has taken a turn for the worse, despite her ongoing role as judge on hit U.S. series America's Got Talent, claiming newer shows have become havens for talentless celebrities.

Osbourne, who became a household name after appearing in fly-on-the-wall show The Osbournes, says: "They are all train wrecks.

“All it is now is a lot of lower-rung celebrities that they've turned into bad actors. None of it is real."