Billie Eilish celebrates her 18th birthday with home video montage

Billie Eilish is celebrating her 18th birthday with a collection of home videos from her childhood.

The "Bad Guy" singer posted the montage on her Instagram Tuesday night, and it starts off with a clip of young Eilish declaring, "Hi, my name is Billie, and I'm going to play a song that I made up on this guitar."

Then there is a smash cut to footage of a crowd going crazy at one of present-day Eilish's many sold-out arena shows.

The montage also includes a number of other home videos of Eilish and her brother, Finneas, and almost every one features an instrument of some sort.

Eilish had a giant 2019, thanks to the release of her debut album, "When We All Fall Asleep, Where Do We Go?" featuring the singles "Bad Guy," "Bury a Friend," "You Should See Me In a Crown" and "All the Good Girls Go to Hell."

In 2020, Eilish is nominated for six Grammy awards and launches a U.S. arena tour March 9 in Miami.