The small, and surprisingly celeb-free, guest list included Mendes' sister, Janet, and Gosling's mom, Donna, as well as other close friends. Gosling's older sister, Mandi, was also seen entering the family's home with a small homemade chocolate cake topped with raspberries while gifts -- including a rocking horse, ball pit accessories and a Disney baby bag -- were awaiting the birthday girl outside the party.
"It was a pretty quiet family affair," an eyewitness tells ET. "There was no music or any sign of other babies or older kids."
The proud parents quietly welcomed their first child Sept. 12, 2014, after meeting on the set of Place Beyond the Pines in 2011. As for Esmeralda's unique (and very Disney) name, Mendes explained, "Ryan and I both love the Esmeralda character from the Victor Hugo novel, The Hunchback of Notre Dame, and we just think it's a beautiful name."
"Amada was my grandmother's name," the 41-year-old actress added. "It means 'beloved' in Spanish."
As for Gosling, the closest the 34-year-old has come to gushing publicly about his baby girl is writing her name on his knuckles. And given how notoriously private he is about his personal life, we'll take it!