Jimmy Kimmel has another big reason to celebrate his youngest child.
“Today is Billy’s 8th birthday,” Kimmel, 57, wrote via Instagram on Monday, April 21. “He is very healthy and strong thanks to the doctors, nurses, therapists, and staff at @ChildrensLA & @CedarsSinai and to those of you who have sent prayers, well wishes and donations through the years.”
Minutes after he was born, Billy had to be rushed into emergency heart surgery. Months later, he had to undergo a second open-heart surgery.
In May 2024, Jimmel confirmed his son underwent his third and “hopefully final” open heart surgery to have a valve put in his heart.
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To celebrate Billy’s latest milestone, Kimmel asked fans and followers to pay it forward and support Children’s Hospital Los Angeles as they work to save more lives every day.
“If you can, please make a gift of $8 to support children who need medical care, the link is in my bio,” he shared. “THANK YOU! 
.”
In response to the post, Children’s Hospital Los Angeles wished Billy a happy birthday before expressing their gratitude for Kimmel’s vocal support.
“We’re so honored to have been a part of your journey,” the hospital wrote in the comments section. “Thank you, Jimmy, for your continued support and for shining a light on the incredible strength of kids like Billy.”
Kimmel — who also shares daughter Jane, 10, with wife Molly McNearney and Katie, 33, and Kevin, 31, with ex-wife Gina Maddy — has been open about Billy’s health struggles since he was born.
He also has continued to give thanks to the doctors and health care workers who have taken great care of his son.
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After Billy received his third open heart surgery, the Jimmy Kimmel Live! host was quick to give thanks to the hospital staff for their “immeasurable kindness and expertise.”
“Walking around this hospital, meeting parents at their most vulnerable, children in pain and the miracle workers who do everything in their considerable power to save them is a humbling experience,” he wrote via Instagram. “We hope you never need CHLA, but if you do — know that they help families regardless of their ability to pay, thanks largely to the Affordable Care Act (another salute to the late Senator John McCain), generous donations from companies like Disney, which I am proud to work for and especially from generous people like you.”
Kimmel added, “Nothing matters more than taking care of each other.”
