It's the end of an era for Ellen DeGeneres — the talk show ... last time to perform "What About Us." Billie Eilish, who was only 1 year old when the show debuted, also stopped by and reminisced ...

Billie Eilish is living out her childhood ... It was, like, a relationship with a person.” In March, Eilish told Ellen DeGeneres she still has a soft spot for the singer.