Katherine called the On Air With Ryan Seacrest show this morning to talk about playing Sadie Ellis on new CBS legal drama Doubt.

Katherine Heigl & Dulé Hill In Doubt Dulé Hill & Katherine Heigl In Doubt

Sadie is a smart, chic, and successful defense lawyer who starts to fall for her client Billy Brennan who is accused of murdering his girlfriend 24 years ago. Her romantic relationship puts her career and happiness in danger, so she needs to prove reasonable doubt – even if she has some herself.

"A guy who’s been accused of murder should maybe be a deal breaker, but I suppose if you’re a defense attorney, the accusation part can be a little like, ‘Well, we can let that slide,’" she joked. "She believes he’s innocent!"

Doubt debuts tonight at 10/9C on CBS. Don’t miss it!