Tulisa tweeted: "My thoughts & prayers are with Gary Barlow and wife Dawn tonight. Heartbreaking."
Other celebrities who have voiced their support for the Take That star include Amanda Holden.
Following the news, Amanda tweeted: "My heart and love goes out to Gary and his family xx".
The BGT star understands more than anyone what Gary must be going through, having suffered her own miscarriage last year.
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Gary has been left grief stricken after Dawn lost the baby eight and a half months into her pregnancy.
The couple had named the baby Poppy and she was due to be born later this month.
Complications meant that Poppy had to be delivered stillborn.
Poppy would have been the couple's fourth baby together.
Last night, the Gary broke the sad news via an official statement in which he asked for his privacy to be respected at this difficult time.
Gary says: "Our focus now is to give Poppy a beautiful funeral".
Corrie star, Kym Marsh has also tweeted her condolences this morning.
She says: "Thinking of Gary Barlow and Dawn at this tragic time. Thoughts prayers and love are with them and their family x".
Even X Factor reject Frankie Cocozza tweeted support to his former mentor sending Gary his thoughts.
Frankie tweeted: "My thoughts are with Gary Barlow and his family, such terrible news."