Frantz was born in Mount Clemens, Michigan[2] to Vicki and John Frantz.[3] She first broke into the soap opera genre in 1997 as Tiffany Thorne on Sunset Beach.[4] Frantz left the show later that year for her role as the villainess turned sympathetic heroine Amber on The Bold and the Beautiful. In 2001, her portrayal garnered Frantz a Daytime Emmy in the Outstanding Younger Actress category. Frantz played the role on B&B until 2005, when she left to focus on a music career. From November 2006 to May 2010, she played Amber on The Young and the Restless. July 1, 2010, marked Frantz's return to The Bold and the Beautiful as Amber, where she remained until 2012. Frantz made a one-episode appearance on The Young and the Restless in September 2013.
In January 2010, Frantz was engaged to actor Scott Bailey.[6] Bailey and she married in California on November 11, 2011.[7] In June 2015, Frantz announced that she was pregnant and gave birth to a girl, Amélie on December 1, 2015.[8] In March 2020, Frantz announced that she was pregnant once again and gave birth to a boy, Lion on June 19, 2020. In November 2021, Frantz announced that she was pregnant once again and gave birth to a boy, Killian in March 2022.