Beyonce Not Pregnant? Stomach Folding Video Ignites Pregnancy Controversy

We know it sounds ridiculous ... but the Internet is buzzing with rumors that Beyonce is NOT really pregnant and she's wearing a fake stomach in an elaborate cover-up. Now, a controversial new video is fueling the fire.

Beyonce appeared on an Australian TV show this weekend called "Sunday Night" -- wearing a tight red dress that accentuated her baby bump.

But when B sits down in her chair, her bump appears to collapse inward, leading many to believe it's not B's real bump after all ... but a prosthetic device intended to deceive.

So why would B fake preggo? There are rumors that she has hired a surrogate mother to carry the kid, so she won't have to put her body through the strains of pregnancy.

But color us skeptical -- because last month, Bey bared all during a vacation in Croatia with Jay-Z ... revealing what looks like a totally legit baby bump.

We called B's camp for comment -- but we haven't heard back yet.

So, we gotta ask ...