Sarah Ferguson and Nick Grimshaw were amongst the guests who paid tribute to Peaches Geldof at her funeral at St Mary Magdalene and St Lawrence church in Davington, Kent on Monday.
The service was held at the same church in which she married husband Thomas Cohen in 2012 and where her mother Paula Yates' ashes were scattered in 2000.
The Davington church is also near the country home in Faversham where Peaches spent much of her time as a child.
The Daily Mail reports Sarah Ferguson smiled at photographers as she got out of her chauffeured car, but made no comment as she walked to the church.
Other mourners included Geldof's close friends Nick Grimshaw, Alexa Chung, Kate Moss and Jaime Winstone as well as PPQ designer Amy Molyneaux, TV presenter Mariella Frostrup and her husband John McCue, Jools Holland and Jo Wood.
The service was held with family and friends in private, but locals have been leaving flowers outside the church since Geldof's death on 7 April.
One message read, "Shine bright like a diamond. RIP Peaches."
Reports suggest Geldof's ashes will be scattered in the garden of the estate. Her father Bob Geldof was expected to give a eulogy at the service.
After news that Peaches had passed away was confirmed, Geldof said in a statement, "We are beyond pain. She was the wildest, funniest, cleverest, wittiest and the most bonkers of all of us."
The cause of her death is still unknown as the recent post-mortem test was inconclusive.