Aubrey Morgan O'Day (born February 11, 1984) is an American singer and reality television personality, best known for being a member of the girl group Danity Kane. Following discord among Danity Kane and with her mentor at the time, P. Diddy, O'Day was fired from the group in 2008, but reunited with them in 2013 before a second disbandment. Danity Kane reunited in 2018 as a trio. She has also performed in the duo Dumblonde with former Danity Kane bandmate Shannon Bex since 2015.
O'Day has modeled for magazines such as Blender and Playboy, and performed on Broadway in Hairspray. In 2011, she signed a solo record deal with SRC/Universal Motown Records, and released her debut EP Between Two Evils in 2013.
Additionally, O'Day has made appearances on reality television shows, including the fifth season of Celebrity Apprentice, Famously Single, Ex on the Beach, and the British Celebrity Big Brother 18.