Aubrey O'Day is an American singer, actress, songwriter, and former member of the girl group Danity Kane O'Day developed a passion for entertaining at age 5, after performing on stage for the first time.

O'Day pursued her love of performing through various leads in musical productions, including Dorothy in The Wizard of Oz, Carmen in Fame, Sandy in Grease, Liesl in The Sound of Music, Tzeitel in Fiddler on the Roof, and Mimi in Rent. She also appeared in Annie.

O'Day attended La Quinta High School in the early 2000s. She later took a double major in Political science and Drama at the University of California, Irvine, and was a member of the Alpha Chi Omega Sorority.

O'Day was discovered in 2004 on the MTV reality show Making the Band 3, founded by Sean "Diddy" Combs, and emerged as the show's breakout star. During Season 2 of Making the Band 3 while the competition was still ongoing, Blender Magazine contacted O'Day to pose for their September 2005 issue. O'Day had dropped out of college and declined going to Columbia Law in order to participate in the competition.

After seeing her dance, Combs was convinced that O'Day had "Black in her family" and further expressed this sentiment after watching her sing a version of "At Last" at a club during Season 1 of the show, his way of complimenting her dancing and singing ability. This, along with what viewers saw as natural charisma, helped endear O'Day to the audience. She became a consistent favorite among judges and fans.

O'Day was eventually chosen to be in the group, and was the first member included. The band became known as Danity Kane and their first album debuted on August 22, 2006, at #1 on the Billboard 200 charts. The group was the opening act for Christina Aguileraon the U.S. leg of her Back to Basics Tour with the Pussycat Dolls

O'Day ranked #86 on Maxim's Hot 100 of 2006 list, and #81 on Blender's 100 Hottest People list. She walked the catwalk at Heatherette's Fall 2007 runway show at Mercedes-Benz Fashion Week held on February 6, and recorded a song with R&B singer Cupid written and produced by D. Harold, Mischke, and T. Thomas , whose title is "Do Yo Dance" and was the new single from Cupid's album "Time For A Change".

In January 2008, O'Day briefly became the face of Famous Stars and Straps, and landed the role as Amber Von Tussle in the Broadway musical Hairspray on July 16, 2008. In addition, she appeared in the comedy American High School costarring Nikki Ziering, which was released in August 2008. O'Day later made a cameo appearance in Estelle's music video for "Pretty Please" the same month.

Further, making use of her success, O'Day started her own clothing line called Hearton My Sleeve, which features t-shirts and accessories available only online.

On the October 7, 2008 episode of Making the Band, after continued debate with O'Day about the well-being of the group, Combs declared O'Day no longer a member of Danity Kane