Katherine Heigl: I Left ‘Grey’s Anatomy’ to Be a Full-Time Mom

While promoting her new action-comedy 'Killers,' co-starring Ashton Kutcher and Tom Selleck and in theaters June 4, Katherine Heigl admitted to ET's Samantha Harris that she regrets leaving "Grey's Anatomy" every day, but said she's grateful that she chose to raise her baby daughter Naleigh full-time instead.

"It was a really hard choice to make and you never quite know, 'Was it the right choice or the wrong choice?'" Katherine said of leaving "Greys." "But the only thing that gives me solace is knowing that if I hadn't [left], I wouldn't have had these months with Naleigh that have just sort of solidified our relationship."

"I needed that to happen," she continued. "I really needed her to get that I'm her mom. And I needed to show her that, I couldn't just tell her."