Gary Barlow has thanked fans for their "overwhelming" support to him and his wife Dawn following the loss of their baby daughter Poppy.
The couple issued a statement earlier this week saying they were "devastated" after Poppy was delivered stillborn on Saturday.
Now the Take That star has tweeted: "Your kind words and lovely messages are overwhelming. Thank you."
A charity fund has been set up by fans in his daughter's memory and aims to raise £100,000 for the stillbirth and neonatal death charity Sands .
A page set up on justgiving.com said the move is a "mark of respect".
A statement said: "As fans and many of us as parents we all want to show love and support to the Barlow family.
"Here we can make a difference, and leave united messages of love and support. This is a united donation from all Gary Barlow and TT (Take That) fans."
Friends and colleagues of the singer used the social networking site to express their condolences.
Band mate Robbie Williams posted on his blog saying: "My thoughts are with Gary, Dawn and family right now x."
Fellow X Factor judge Tulisa Contostavlos wrote: "My thoughts & prayers are with @GBarlowOfficial and wife dawn tonight. Heartbreaking x."
Andrew Lloyd Webber wrote: "Dearest Dawn & Gary, Madeleine & I are devastated about news of Poppy. Our thoughts & prayers are with you and your family. @GBarlowOfficial."
The couple, who have been married for 12 years, revealed in April this year that they were excited to be expecting another girl.
They have three other children - Daniel, 11, and daughters Emily, nine, and Daisy, three.
The announcement has cast doubt on whether Barlow will appear at Sunday's Olympics closing ceremony.
The singer has been widely tipped to play the show with his Take That band mates and a final decision is expected later this week.