Although the notoriously private couple never even publicly confirmed they were expecting, reports in the US claim that Eva gave birth to baby girl in Los Angeles on Friday, 12 September.
A source told E! News: "Eva is so happy she's a mum, their baby girl is perfect! They are at home now with the baby and Eva is feeling great."
Eva, 40, and Ryan, 33, have always kept their romance away from the cameras so we're thinking the chance of them releasing any cute newborn baby pictures is pretty much nada.
Rumours of a pregnancy only surfaced in July when it was said Eva was seven months along. The news surprised many - not least because no one had spotted any baby bump on Eva!
While Eva and Ryan kept quiet, US TV host Ellen DeGeneres tweeted at the time: "Congrats to @RyanGosling and @EvaMendes! That's going to be the most beautiful, bilingual, part-superhero, well-dressed, romantic baby ever!"
Just a few months earlier Eva had appeared on Ellen's show and actually laughed off pregnancy rumours which arose when she refused to step into a full body scanner at an airport.
In February, the star explained: "It's so ridiculous. It all started because I didn't want to go through the X-ray scanners at the airport. They are really creepy. They basically see you naked, right? And not only that, but there is a radiation aspect to it so I always opt out and ask for a personal pat down."
Congrats to Eva and Ryan!
Stars who welcomed babies in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe