September 06, 2012 08:00 PM

Gregg DeGuire/WireImage

Amber Rose is pregnant!

Wearing a floor-length lace Furne 1 gown, the model and fiancé Wiz Khalifa confirmed the happy news to PEOPLE as they debuted her bump at the MTV Video Music Awards on Thursday.

“We do know the sex, but we’re [keeping it private] for now,” Rose, 28, tells PEOPLE. “We just found out two days ago, so we’re super excited.”

Until this point, Khalifa, 24, had denied pregnancy rumors. Last month, he addressed the issue.

“She will have my baby in life,” the “Payphone” rapper said. “And you will know when she’s pregnant. But it’s not the time now for people to start going crazy.”

Now that the cat’s out of the bag, Khalifa — who proposed to Rose in March — says he’s focused on the future.

“I’m superman!” he tells PEOPLE. “I’m going to the best dad and the best performer and the best husband that I can be.”

Frederick M. Brown/Getty

— Maggie Coughlan with reporting by Gabrielle Olya

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