O'Day began the role of Amber Von Tussle in the Broadway musical "Hairspray" on July 18, 2008. She appeared in the 2009 comedy "American High School" costarring Nikki Ziering, and also joined the cast of Jerry Mitchell's musical "Peepshow" in the role of "Peep Diva" at the Planet Hollywood Resort & Casino in Las Vegas, Nevada from September 2009 to late December 2009. Additionally, O'Day was featured on the Donnie Wahlberg single "I Got It." She recorded a remastered version of Sharam's remix hit "Party All the Time" and released a track titled "Never Fallin".