Ashton Kutcher, Scout Willis Ashton Kutcher, Scout Willis

Ashton Kutcher and 19-year-old stepdaughter Scout Willis have released a duet on YouTube — about coffee.

In the video for "My Sober," Kutcher, 32, plays guitar and provides backup vocals, while Willis — Demi Moore and Bruce Willis' second daughter — croons what they describe as a "little song about a loved one."

The most impressive part? They said they wrote it shortly before filming the video.

Watch the video and weigh in below: