When did Billie Eilish release her debut EP, Don’t Smile At Me?

Billie Eilish released her debut EP on 22^nd December 2017, titled Don’t Smile At Me. The 9-track EP contained tracks such as:-

1. Copycat
2. Idontwannabeyouanymore
3. My boy
4. Watch
5. Party favor
6. Bellyache
7. Ocean eyes
8. Hostage

The album reached the top 15 in the US, UK, Canada & Australia charts.