Jimmy Kimmel's son undergoes 'scheduled and successful' heart surgery, says rep

— -- Jimmy Kimmel's infant son, Billy, has undergone a "scheduled and successful" heart surgery, according to a representative for his ABC show, "Jimmy Kimmel Live!"

The representative added that this week, the late-night host will take time off to be with his family, and his show will be helmed by guest hosts.

On Monday, hosting duties fall to Chris Pratt, followed by Tracee Ellis Ross on Tuesday, Neil Patrick Harris on Wednesday and Melissa McCarthy on Thursday.

Kimmel has not yet commented on his son's procedure.

Kimmel, 50, announced in May that Billy, now 7 months old, had been born with a heart defect that required emergency surgery. The baby's condition compelled the late night host to delve into the national healthcare debate, with Kimmel arguing passionately for coverage for those with preexisting conditions.

"Before you post the nasty Facebook message saying I'm politicizing my son's health problems, I want you to know, I am politicizing my son's health problems because I have to," he said in September.