The TV presenter died of an overdose in 2014 when she was aged just 25.
Marking what would have been her sister's milestone birthday on Instagram, Fifi, 35, shared a picture of Peaches as a young girl.
She wrote: "Thinking of her and missing her more than ever on what would've been her 30th birthday."
Peaches was found dead at her home in Wrotham, Kent in April 2014.
An inquest into her death found she had died of a heroin overdose.
Her mother Paula Yates died from the same cause when Peaches was 11-years-old.
The model was at home with one of her sons at the time of her death.
She and husband Thomas Cohen welcomed Astala Dylan Willow Geldof-Cohen in 2012 and Phaedra Bloom Forever Geldof-Cohen in 2013.
Speaking to German newspaper Bild about her death in 2017, Cohen said: "When I found her, I was not surprised. I thought to myself at the moment: ‘Yes of course – you had to do that.'"
Her father Sir Bob Geldof said at the time: "We are beyond pain. She was the wildest, funniest, cleverest, wittiest and most bonkers of all of us. We loved her and will cherish her forever."
Her funeral was held in the same church where she was married, where her parents were married, and where her mother's funeral service was held.
It was also where Fifi married husband Andrew Robertson in September 2016.
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