Ryan Gosling and Eva Mendez Do Lunch with First Kid, New Baby Still Under Wraps

Eva Mendes flashed a "fooled ya" smile on her way out of lunch with Ryan Gosling and Esmeralda -- the kid we knew about, but baby Amada was still hidden from sight.

Ryan and Eva went out with the fam in L.A. for Mother's Day ... 24 hours before TMZ broke the story that they'd secretly already had their 2nd child on April 29.

Eva was still hiding behind her giant handbag, because on Sunday they were still pulling Operation Fake Stork Delivery. Shortly after the jig was up on Monday afternoon ... Ryan walked into Jimmy Kimmel's studio (where there was NO mention of Amada's birth).

It'll be interesting to see if Eva's still covering up the next time we see her.