She said the media frenzy surrounding Spears and her relationship with the Birmingham-born snapper had caused her to go "insane".
Paltrow, whose own marriage to Chris Martin has been scrutinised in the press, said: "Look at what they've done to Britney. The paparazzi and magazines have blood on their hands. They literally made her go insane.
"She's got classic Stockholm Syndrome - she fell in love with a paparazzo and went insane. The photographers and editors of these magazines have such bad karma. It's pretty dark."
Paltrow's mum Blythe Danner recently spoke out to quash rumours that her daughter's relationship is on the rocks.