Jimmy Kimmel has talked a lot about his infant son, Billy, on his late-night talk show—and on Tuesday, fellow talk-show host Ellen DeGeneres had a big surprise for Kimmel when he came on her show. Billy was born with congenital heart disease and has had multiple surgeries over his 10 months of life; DeGeneres revealed to Kimmel that a room at the Children's Hospital of Los Angeles' Heart Institute has now been named after Billy, Us reports. "Wow," a teary Kimmel said—before joking that some of Billy's nurses, who were in the audience at the time, "should be at work." Kimmel has referred to his son's plight while advocating for universal health care in the US. (More Ellen DeGeneres stories.)