Halle Berry The Jiffy Pop Effect!

4/12/2013 6:05 AM PDT

Pregnant Halle Berry -- The Jiffy Pop Effect!

Just like a batch of gorgeous Jiffy Pop popcorn, mom-to-be Halle Berry's baby bump is blowin' up.

While barely showing any overt signs during the last few weeks, the beautiful three-plus months preggers 46-year-old heated up the premiere of her latest bomb, "The Call", in Rio on Thursday ... and showed off her suddenly huge Halle belly.

At this rate, the Oscar winner should max out at Jessica Simpson DEFCON One pregnancy stage levels in no time.