Fifi (full name Fifi Trixibelle) posted the grainy picture on Instagram today after the sad death of her sister Peaches, who passed away at home yesterday aged just 25.
The photo shows the girls stood outside together in the summertime and Peaches can only be about two or three.
Alongside the snap, Fifi said: "My beautiful baby sister... Gone but never forgotten. I love you, Peaches x."
News broke just after 6pm yesterday (7 April) that Peaches had been found dead after police were called to her countryside home in Kent at lunchtime.
Police have since confirmed that they are not treating the mother-of-two's death as 'suspicious' and have said that a post-mortem will be carried out in the next few days.
Following the announcement, Peaches' devastated musician father Bob Geldof released a statement saying that the family were "beyond pain".
Peaches' husband Thomas Cohan, who she had two baby sons with, also said in a separate statement that his wife was "adored", adding: "We shall love her forever."
Since her death, celebrities have been paying tribute to Peaches on Twitter while also expressing their shock.
Peaches, whose mother Paula Yates died from an accidental drugs overdose in 2000, leaves behind Thomas and their children Astala, nearly two, and Phaedra, nearly one.
Peaches Geldof: Her life in pictures
Copyright: Rex Features Dennis Stone