Rihanna Appears Pregnant: Unveils 'Baby Bump'!! (PICS)

Rihanna appears to be pregnant with her first child, and all of social media is talking about it. And while Rihanna is not openly talking about her alleged new pregnancy - she's not hiding it either.

Last night Rihanna performed at her annual Angel's Ball charity dinner and wore a form fitting dress that clearly showed her belly bulge.

The rest of Rihanna's body was skinny - and it was just her belly that was protruding.

Here's the video that's making the rounds online:

MTO News spoke with multiple people at the event, and they all confirmed that Rihanna - who is known for heavy drinking - was not drinking that night.

Here's Rihanna pretending to drink some wine - but not sipping any of it:

So how can we be so sure that Rihanna is pregnant? We asked one of Rihanna's reps about her bump, and instead of getting a "no" . . . we got a "no comment."

Rihanna has been dating her longtime boyfriend Hassam Jameel - a Saudi billionaire - for more than three years and they share a home together in London.

Below are some pics of Riri at the event.