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

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?!?!"