Kelly Rowland Beyonce's Pregnant?! WHAT?!?!

5/17/2013 2:30 PM PDT

Former "Destiny's Child" singer Kelly Rowland had NO IDEA Beyonce was pregnant with a second child ... either that, or she deserves an Oscar for the performance she just gave in a L.A. parking lot.

Kelly was on her way out of a cafe when we asked how she felt about the latest reports ... that Beyonce is pregnant with baby #2 -- and Kelly looked totally flabbergasted, saying, "WHAT?!?!"

But it's likely she actually did know ... because as soon as we started asking more questions, Kelly clammed up.

So we gotta ask ...