Cheryl Cole has been admitted to hospital following a romantic holiday to Africa.
The singer collapsed during a photo shoot on Saturday and was initially diagnosed with exhaustion.
But friends of the X Factor judge say her condition dramatically deteriorated the next day.
Doctors took urgent tests and admitted her to hospital where it was confirmed she was suffering from the highly infectious malaria.
The 27-year-old is thought to have caught the deadly disease while holidaying in Tanzania with her dancing partner Derek Hough.
A source told The Sun, "She told doctors she'd had stomach pains since her return from Tanzania. On Sunday evening her condition deteriorated so rapidly she knew it was something serious."
"She'd spent 48 hours in bed trying to sleep off what she thought was a stomach bug. She was extremely weak, sweating and drifting in and out of consciousness. She was driven to hospital where tests showed malaria. Everyone is really concerned. She is very ill."
It is thought that Cheryl will remain in hospital and under close observation for the next couple of weeks before being able to rejoin the rest of the X Factor team.
Ray-Ban sunglasses collection - Ray-Ban 3025 Aviator
Cheryl Cole has gone from WAG to fab through a stint on reality TV. The 27-year-old has made herself one of the central characters on The X Factor, as a replacement for Sharon Osbourne, and has become one of the most watched fashionistas around.
Her style is classic with a modern twist; chunky accessories, massive handbags, anything that makes her stand out. She also has a few favourite pieces that she cannot get enough of including the Ray-Ban 3025 Aviator.
The 3025 is the number one sun style in not only the Ray-Ban sunglasses collection but on an international scale. It was originally designed for US military fighter pilots in 1937 to protect them from glare at high altitudes whilst maintaining a clear field of vision. Today it is the ultimate provider of style and cool yet still reflects the importance of anti-glare and UV protection with polarised lens technology.
Incorporate a pair of Ray-Ban sunglasses as part of your look and you will be in great company. Serious stars Jake Gyllenhaal, Ashley Greene, Anna Friel, Beyonce Knowles, Cheryl Cole, Jennifer Aniston, Kanye West, Leona Lewis, Mischa Barton, Sienner Miller and Victoria Beckham have all worn Ray-Ban sunglasses. However, you do not need to be a red carpet regular to pull off this cool style. Ray-Ban is all about self expression and is fully focused on providing stylish eyewear that compliments you, the wearer. Update your wardrobe and give it an entirely new angle with the Ray-Ban 3025.