Jimmy Kimmel returns to host 'Jimmy Kimmel Live!' after opening up about son's heart condition

LOS ANGELES -- Jimmy Kimmel returns to host "Jimmy Kimmel Live!" on Monday, one week after giving an update about his newborn son.

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.

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..."

One of Kimmel's guests for Monday night is Louisiana Senator Bill Cassidy.

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 Eyewitness News News at 11 p.m.