Kerry Katona has been admitted to hospital after showing symptoms of pre-eclampsia, according to her publicist Max Clifford.
The former Atomic Kitten member, expecting her fourth child in May, was being treated in Macclesfield, Cheshire, as a "precautionary measure".
The 27-year-old from Warrington was admitted to the Priory rehabilitation clinic for a fourth time last week suffering from depression after tabloid reports claimed second husband Mark Croft had cheated on her.
And after her legs swelled and she experienced pain in her feet, the former I'm A Celebrity Get Me Out of Here! winner has been sent to hospital, Clifford confirmed.
"She's been in a lot of pain, particularly in the last few days," he said. "The symptoms she's showing are possibly that of pre-eclampsia."
A potentially-fatal condition, pre-eclampsia affects expectant mothers and manifests itself through headaches, sight problems and sudden weight gain.
However, Clifford said Katona's condition "could be water retention".
"She's still in hospital at the moment," he went on. "She has been in increasing pain. She can hardly walk.
"She's had a pretty rough time. It's got worse and worse. We're hoping that everything will settle down."
Katona has two daughters by her first husband, former Westlife star Brian McFadden, and a third daughter with Croft.