The 23-year-old, who suffered a health scare while filming the latest series of Celebrity Big Brother, is pictured lying in a hospital bed, hooked up to the intravenous drip.
"Just woke up," wrote Sam next to the image.
The Saturdays singer Una Foden was quick to show her concern, tweeting, "@SamanthaFaiers hope you ok? You came across so lovely in that house, fair play to you for being such a lady and an example to women x."
Sam's legion of fans followed suit, sending their wishes and thoughts on the social media site.
The Essex-born star was rushed to hospital twice while on Celebrity Big Brother for blood tests and scans, but doctors still don't know what's wrong with her. Sam was thought to have suffered an allergic reaction after her face swelled up and she couldn't hold food down.
"For two weeks I couldn't hold food down whatsoever," Sam told This Morning. "I still haven't had my results back from the hospital and I was in and out of hospital while I was in there as well. I went in there twice for blood tests and scans and it was really serious.
"As much as I tried to do as much as I could, with the more tricky tasks I couldn't do them for health and safety. I couldn't drink alcohol so I was absolutely gutted."