After getting her start off-Broadway and on One Live to Live, Peet guest-starred on a handful of television shows, including The Single Guy and Seinfeld, and starred in the short-lived WB series Jack & Jill (1999-2001). Peet has had steady film work, including appearances in She’s the One (1996), Southie (1998), The Whole Nine Yards (2000), Saving Silverman(2001), Igby Goes Down (2002), Something’s Gotta Give (2003), and A Lot Like Love with Ashton Kutcher (2005). She co-starred in the NBC comedy-drama Studio 60 on the Sunset Strip with Matthew Perry.