AceShowbiz - Kelly Osbourne shared on her Instagram Story on Saturday, December 28 that she's been under the weather with a relentless 100.2-degree fever. "Still going strong. I have put ice on my body, taken meds, tried to sweat it out in the bath and nothing is working!" she wrote, accompanied by an image of her thermometer.

The "Fashion Police" alum, who shares a 1-year-old son, Sidney, with boyfriend Sid Wilson, elaborated further in a separate video, "Day three of having a fever and a little cough."

Kelly, 40, has been battling respiratory syncytial virus (RSV), a common illness that causes infections of the lungs and respiratory tract. "Babies bounce back so quickly but I don't seem to be at all. I don't want to be sick anymore," she vented.

The virus, which the Mayo Clinic notes is particularly prevalent in winter and affects most children by age two, has also hit little Sidney, who is dealing with a double ear infection on top of RSV. "He's such a trooper and he's doing so good," Kelly said proudly of her son.

This isn't the first time the mom and son duo have faced health challenges together. Back in August 2023, Kelly revealed on social media that they were both battling the flu.

Additionally, the family had a health scare earlier this year when Sidney's father, Slipknot rocker Sid Wilson, sustained severe burns following an explosion at their farm. At the time, Kelly accompanied him and their son to the emergency room, reminding her followers, "This is why you don't f*** with burn piles."

Despite these setbacks, Kelly remains resolute. She shared how Wilson's face was "basically melted from the nose down," but marveled at how quickly he was beginning to heal. "But the swelling's gone down, and they said the face is kind of amazing that it's regenerative, it happens real fast, seems to heal quickly," Wilson stated in a conversation with Fox News Digital.

In 2022, Kelly and Sid welcomed their son Sidney into the world. Their journey is a testament to resilience and strength, highlighting how the family navigates through life's unpredictable challenges together. Through it all, Kelly remains optimistic, drawing strength from her son's recovery and her partner's resilience, truly embodying the spirit of a rockstar mom.