Peaches Geldof 'Gone But Never Forgotten'
Peaches Geldof's older sister Fifi has paid tribute to her "beautiful baby sister" by posting a photo online of the pair of them as children.
said they were continuing to investigate
her death, adding that a post-mortem examination will be carried out "in the
next few days".
The message on Instagram said: "My beautiful baby sister ... Gone but never forgotten. I love you, Peaches x" and was accompanied by a picture of the girls posing in summer dresses.
It comes as Fifi and her family must come to terms with the sudden death of Ms Geldof at her home in Kent on Monday.
The death of the mother-of-two, who had worked as a DJ, model and television personality, is being treated as unexplained, but not suspicious.
Police were called to her house in the village of Wrotham, Kent, at 1.35pm after receiving a report of concern for the welfare of a woman.
Officers said Ms Geldof was pronounced dead at the scene and they are continuing to investigate her death, adding that a post-mortem examination will be carried out on Wednesday.
Ms Geldof had previously admitted drug use as a teenager but said in 2009 that she was "sober now".
In her last message on Twitter, she posted a picture of her as a child with her mother, Paula Yates, who died of a heroin overdose in 2000 when Peaches was 11.
Lily Allen is among a host of celebrities to pay tribute following the sudden and tragic death of the 25-year-old.
The singer said: "My thoughts are with Peaches' family at this awful time. I hope they get to grieve in peace. Peaches, rest in peace gorgeous girl."
Scottish musician Midge Ure, who co-organised Band Aid with Bob Geldof, told Sky News the news was "astounding" and "hideous".
"It's just unbelievable that any one family can have so much tragedy and loss in their lives, it's just horrible."
As news of her death emerged, Kelly Osborne, a childhood friend of Peaches, tweeted: "Words seem inadequate 2 express the sadness I feel about @peaches_g death We are here 2 support U @pixiegeldof1 stay strong my little Pepsi!"
TV and radio presenter Dermot O'Leary said: "Met Peaches several times. Really sweet girl. So so sad for the Geldof family. Thoughts and prayers..."
The Hollywood actress Susan Sarandon said: "No words can express any comfort at the loss of a child and mother as beautiful as Peaches Geldof. God bless."
Coleen Rooney, wife of England footballer Wayne, tweeted: "Can't believe what I have just heard. RIP Peaches Geldof, such sad news."
X Factor creator Simon Cowell tweeted: "So sad to hear about Peaches. Rest in peace."
He said later: "The few times I met Peaches she was a sweet, funny warm person. Much love to her family she has left behind."
Sharon Osborne wrote: "Devastated about @peaches--g. Sending condolences & respect to the Geldof family. It's unimaginable what they must be going through right now."
Presenter Myleene Klass tweeted: "The news of beautiful Peaches is utterly devastating, God bless her babies. RIP mama xxx"
This Morning host Phillip Schofield, who appeared with Ms Geldof on the ITV show, wrote: "Utterly stunned at the terrible news of the death of Peaches Geldof! The dreadful loss of a really lovely woman."
His co-host Holly Willoughby said: "Just heard about Peaches, so unbelievably tragic. So shocked and sad. Sending my thoughts and love to her family".
Coronation Street star Antony Cotton said: "May flights of angels sing thee to thy rest".
In a post on Twitter, rapper Professor Green said: "never knew Peaches but the loss of a life so young is a horrible thing, especially leaving behind two children".
Singer Ellie Goulding said: "Even if you think you've got it all figured out, some things still can't be explained or understood. Two beautiful children. RIP Peaches".
Her friend the model Daisy Lowe posted a picture of a broken heart on Twitter.
Author Irvine Welsh said: "Very sad to hear of the tragic, untimely death of Peaches Geldof. Thoughts with Bob G and the family."