Beyonce -- I'M PREGNANT!!!!

Beyonce just showed up to the MTV VMAs with a very special guest -- HER FETUS.

Rumors have been swirling about B having a bun in the oven for weeks ... but tonight she confirmed the buzz by showing off her baby bump on the red carpet.

With Beyonce as the mom ... and Jay-Z as the dad -- one thing's for sure ... THAT KID IS GONNA BE RICH!!!!

For more on the MTV VMAs check out TooFab.com.