Peter Andre has been taken to hospital today "in excruciating pain", a spokeswoman for the star said.
The singer was due to play the Plymouth Pavilions tonight (Friday) but the concert has been postponed.
Peter's manager Claire Powell said: "We are very worried about Peter and at present we do not know what is causing him to be in so much pain. Peter is terribly disappointed that he is unable to perform at tonight's sold-out opening night. At this time we have no more information though we are hoping Peter will be able to perform at Minehead tomorrow as planned. We will keep his fans informed via his website www.peterandre.com for further information on the situation."
The Plymouth concert has been re-scheduled for Tuesday December 21.
Peter's ex-wife Katie Price tweeted the news earlier in the day, saying: "I'm told CAN (Pete's management company) are going to release a statement saying pete been rushed to hospital with stomach pains!why does press need to know!"
She then added: "hope pete ok."
Peter is best known for his marriage to the glamour girl which ended in September last year.
The pair married after romance blossomed in front of viewers on I'm A Celebrity... Get Me Out Of Here!
They have two children together, Junior, four, and Princess Tiaamii, two, alongside Price's son Harvey with footballer Dwight Yorke.