Fifi Geldof has spoken out about her battle with depression, which she says has hit her "full whack" since her sister Peaches died from a heroin overdose back in April.

The 31-year-old took to Instagram last night to talk about her struggle. "You can’t escape it, it just simmers under the surface," she said. "People wouldn’t have the first clue of it to look at me or talk to me, though."

PR executive Fifi said she has become good at hiding her true feelings from others. "I wear a permanent mask so I won’t be judged for feeling how I actually feel."

Though she has suffered from depression for a number of years, Fifi’s condition has understandably worsened since the death of her sister. However, it was Robin William’s recent suicide that prompted Fifi to open up to her fans.

Alongside a picture of Robin, Fifi wrote, “Depression needs to be taken more seriously. No-one should feel pushed to those actions by their all-encompassing misery.”

She later explained why she had spoken out, saying her posts were “a feeble attempt to bring some more awareness and understanding to something that oughtn't be surrounded by such stigma.”