Washington, Apr 24 : Ashlee Simpson is determined to keep people guessing about whether or not she's pregnant.

The singer is said to be expecting her first child with fiance Pete Wentz, but she's determined not to let on anything.

She even managed to avoid the question when she appeared on the Ellen DeGeneres show and was asked the question point blank by her host.

"Well, that has been going on for quite a while. That is definitely something that I choose personally not to discuss except for the fact that maybe....Do I look like I had 10 cheeseburgers or something ... because I don't think I do," usmagazine.com quoted her, as saying.

When, pointing to a snap of Jennifer Lopez, DeGeneres then asked, "You're not going to keep this answer up as long as this woman did...."

Laughing, Simpson replied, "No, I'm not. I swear. I promise you that. I give you my pinky on that."

ANI