Maandig has worked with LA-based Songwriter BAO and appeared as a guest vocalist on two of his band Ming & Ping's songs, "Mixed Melodies" from their eponymous 2009 album and "Chinatown" from 2012's The Darkness of Night, where she is credited as Mariqueen Maandig Reznor. She also provided backing vocals on the track "She's Gone Away" on Nine Inch Nails' 2016 EP Not the Actual Events.
Maandig married Trent Reznor in October 2009. They have four children: sons Lazarus Echo (born October 10, 2010), Balthazar Venn (born December 31, 2011), a third son whose name has not been revealed (born November 1, 2015) and daughter Nova Lux Reznor (born December 3 2016).
