If pop singer Ashlee Simpson is really pregnant, she isn't willing to share that information with the world just yet. During her appearance on the "The Ellen DeGeneres Show" on Thursday, she refused to answer Ellen's persistent questions about whether or not she is expecting a baby.

Ashlee, who is engaged to Fall Out Boy's Pete Wentz, did her best to avoid the pregnancy rumors as she taped the Ellen show, which will air on Thursday. Ellen asked her directly, "Are you or are you not pregnant?"

Simpson replied, "Well, that has been going on for quite a while. That is something that I choose personally not to discuss."

Ashlee then changed the subject and said, "Do I look like I had 10 cheeseburgers or something?" she asked the audience, standing up and showing her still-slim figure. "Because I don't think I do."

Ellen gave it one more try, asking, "Is it a boy or a girl?"

But Simpson only laughed and said, "Ah. You're funny."

Ashlee is the sister of pop star Jessica Simpson.