The 23-year-old singer – who's newly engaged to Fall Out Boy's Pete Wentz – tried her best to avoid answering the million-dollar question during her appearance on The Ellen DeGeneres Show. (The episode is set to air Thursday.)
When asked directly, "Are you or are you not pregnant?" Simpson demurred: "Well, that has been going on for quite a while. That is something that I choose personally not to discuss."
She then skillfully changed the subject. "Do I look like I had 10 cheeseburgers or something?" she asked the audience, standing up to show her still-slim figure. "Because I don't think I do."
The dogged DeGeneres then asked Simpson to promise that if she is pregnant, she doesn't keep fans in suspense as long as Jennifer Lopez did.
"I swear," Simpson responded. "I promise you that. I give you my pinky on that." (The two then shared a quick pinky-swear.)
DeGeneres gave it one last shot, asking quickly, "Is it a boy or a girl?" But Simpson could not be tempted.
"Ah," she said with a laugh. "You're funny."