Fifi Geldof battling depression

Fifi Geldof's battle with depression hit her "full whack" following the death of her sister Peaches in April (14).

The 25-year-old socialite died of a heroin overdose in the spring (14), and her elder sister Fifi, 31, now admits she has been struggling with mental health issues for years and her condition has worsened since the tragedy.

Fifi, the eldest daughter of rocker Bob Geldof and late TV star Paula Yates, made the revelation on Instagram.com on Thursday (14Aug14), adding that Robin Williams' death this week (beg11Aug14) and subsequent debate about his depression spurred her on to open up about her troubles.

She writes, ''I think this has prompted me to want to speak out publicly about my own depression which I've suffered from for years... Just in a feeble attempt to bring some more awareness and understanding to something that oughtn't to be surrounded by such a stigma.

"I wear a permanent mask so I won't feel judged for feeling how I actually feel... You can't escape it, it just simmers under the surface when it's not hitting you full-whack... Which, for obvious reasons, it has done to me for the last few months... People wouldn't have the first clue of it to look at me or talk to me, though.''