The onlooker responded, “Oh, he’s so cute!”
The couple also share three-year-old son Jonathan together.
Hathaway confirmed she was pregnant with her second child last July, sharing a black-and-white photo of her bulging belly to Instagram.
“It’s not for a movie … #2,” she captioned the adorable snap at the time. "All kidding aside, for everyone going through infertility and conception hell, please know it was not a straight line to either of my pregnancies. Sending you extra love."
A month after announcing the news, Anne's closest friends and family threw her a surprise baby shower which was held at her Upper West Side home.
"It was a surprise baby shower! Anne walked in and everyone yelled 'Surprise.' She looked completely shocked and put her hand over her mouth then her face," the insider shared. "She hugged one of her friends and said 'You guys are so good,'" a source told E! News.