RELATED: Obama, celebs support Kimmel after son's health scare
During an emotional and heartfelt monologue, Kimmel explained, "They found that Billy was born with a heart disease."
The late night talk show host took last week off, after telling viewers about his son's open-heart surgery. The family says Billy is doing great.
sincere thanks for the outpouring of love & support - Dr. Jane is keeping a close ear on Billy, who is very well - XO pic.twitter.com/QgSUminhmg— Jimmy Kimmel (@jimmykimmel) May 2, 2017
On Monday, the "Jimmy Kimmel Live!" team tweeted a sweet photo of Kimmel laughing during rehearsal at the desk, surrounded by mariachi musicians. They wrote, "He doesn't like when we make a fuss, so we did anyway..."
He doesn't like when we make a fuss, so we did anyway... pic.twitter.com/uOJUdPOYmB— Jimmy Kimmel Live (@JimmyKimmelLive) May 8, 2017
One of Kimmel's guests for Monday night is Louisiana Senator Bill Cassidy.
Cassidy-Collins plan passes the #KimmelTest. Maintains coverage, protections for preexisting conditions, BUT in a fiscally conservative way.— Bill Cassidy (@BillCassidy) May 8, 2017
The republican said a health care bill should pass the "Kimmel test" and cover pre-existing conditions.
Watch "Jimmy Kimmel Live!" weeknights at 11:35 p.m. after ABC7 News at 11 p.m.