Rock matriarch Sharon Osbourne has slammed America's obsession with reality TV - insisting the new wave of shows 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 MTV's 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."