As of 2009, Rosemont has appeared in musical comedy-drama Glee as recurring character Carole Hudson, the on-screen mother of Finn Hudson, played by Cory Monteith. In an interview in April 2011, she was enthusiastic about continuing her role in the series, saying "It's a great storyline, and it's going further, but there are so many people to accommodate. But hopefully these characters will grow and even the public and whatever will want to see more of them, so hopefully that will be it." In 2014, she appeared in three episodes of The Fosters.
Rosemont is married to American actor Stephen Root. The marriage is Root's second, and he has a son from his previous marriage. The couple were due to appear on-screen together in the 2011 horror film Red State, but Rosemont was forced to pull out due to a scheduling conflict with Glee. They both appeared in a 2011 episode of Fringe.
