Credit: Instagram

It's hard to believe, but Melissa Gorga's youngest, Joey, Jr., turned four years old over the weekend — time really is flying! The Real Housewives of New Jersey mama took to Instagram to post a picture of Joey on his big day

"My Baby Boy is 4 today!! Happy Birthday Joey! #myheart," Melissa wrote next to the adorable image.

The little guy could not look any sweeter. Donning a "Birthday Boy" crown and holding a balloon with one hand, Joey is flashing the camera an angelic smile while holding up four fingers to indicate his new big-boy age.

It seems like just yesterday little Joey was still crawling around in diapers, but now he's turning into a young man just like his older brother, Gino. Although, while Gino is a dead ringer for his dad, Joey Gorga, baby Joey actually looks exactly like Melissa! Just pin a high pony on him and throw on some smoky eye makeup, and the two would be twins.

We're not sure how the Gorgas decided to celebrate Joey's big day, but based on a few other Instagram pictures, it looks like they hit up a nearby aquarium.

The same day she posted Joey's birthday shot, April 27, Melissa added a selfie to Instagram posing in front of a large tank filled with colorful fish. It sounds like fun!

As it happens, Jacqueline Laurita also celebrated a birthday over the weekend, when she turned 44 on April 26. We hope they all had a great weekend!

Do you agree that little Joey looks more like Melissa than his father? Sound off below!