Mendes and the Big Short heartthrob, 35, began dating shortly after meeting on the set of The Place Beyond the Pines in 2011.
Despite being one of the most popular couples in Hollywood, the pair has managed to maintain their privacy. In September, they celebrated Esmeralda's first birthday at their Los Angeles home, surrounded by only family and close friends. Additionally, Esmeralda has yet to make any public appearances and mom and dad have refrained from releasing any photos of her.
With the new baby on the way, will Mendes and Gosling enlist professional help to assist around the house? In September, Mendes told Wendy Williams that they elected not to hire a nanny.
"I've never appreciated my family so much, they've been amazing," said Mendes, revealing that her family has been a big help with her daughter. "I don't technically have a nanny, but I do have help. I like to clarify. I'm certainly not anti-nanny, you do what you need to do as a parent, but I'm so grateful that I have help with my family and [Gosling's] family."