Beyonce’s documercial, “Beyonce: Life Is But a Dream,” attracted 1.8 million viewers to HBO for its Saturday 9 p.m. premiere, Nielsen said Tuesday. That’s the biggest audience for an HBO documentary in a decade. Beyonce co-directed the project.

Beyonce and Oprah Winfrey speak onstage at the HBO Documentary Film "Beyonce: Life Is But A Dream.” (Larry Busacca/GETTY IMAGES FOR PARKWOOD ENTERT)

For comparison’s sake, Spike Lee’s 2006 HBO docu, “When the Levees Broke: A Requiem in Four Acts,” premiered with an average of 1.7 million watching.

Insert sad commentary on American TV audience here.

On a less depressing note, the Season 3 finale of PBS’s “Downton Abbey” averaged 8.2 million viewers Sunday — nearly 3 million more viewers than those who watched the Season 2 finale in February of ’12.

Season 3 more than quadrupled PBS’s prime-time average during its run and exceeded the season average of the second season by 66 percent.

Hugh Bonneville portrays the patriarchal Lord Grantham in the series, "Downton Abbey." (Joss Barratt/AP)