Her baby's put her love on top!

Hours after confirming her pregnancy to photographers on the black carpet, Beyonce really, really announced she's expecting to the world during an unforgettable performance at Sunday's MTV Video Music Awards.

Radiant in D&G pants and a sequined top, Beyonce began her song "Love on Top" with a rousing invitation to the audience: "Tonight, I want you to stand up on your feet -- I want you to feel the love that's growing inside me!"

Once her showstopping, energetic song was done, the superstar, 29, then unbuttoned her jacket, rubbed her belly, and flashed a giant smile. In the audience, cameras showed hubby Jay-Z beaming ear-to-ear as pal Kanye West congratulated him.

It will be the first child for Beyonce and Jay-Z (real name: Shawn Carter), 41, who wed in April 2008.