Meghan Trainor and Daryl Sabara officially have a family of four!

The "Mother" singer, 29, and the Spy Kids star, 31, welcomed their second baby boy on Saturday, July 1, Trainor confirmed in an Instagram post. She shared a series of images of their newborn son, Barry Bruce Trainor, including him being held by family members and her in her hospital room before going in for her c-section.

"On July 1st (our 7 year anniversary of our first date) we welcomed Barry Bruce Trainor into the world ????????," Trainor captioned the post.

"He was a big boy at 8lbs 7oz...and sideways (transverse), but we had an amazing, successful c-section, and I finally got my skin to skin time! Thank you to all of the incredible doctors and nurses who took such great care of us ??."

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The comments were filled with congratulatory remarks, including one from actress Chrissy Metz who wrote, "Awww, Congratualtions!!!!! ???????."

Mandy Moore also wrote a sweet message to the family: "Go Mama!! And welcome to the party, Barry!! What a lucky dude!! ????????."

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The new arrival joins the couple's son Riley, 2, whom Sabara recently told PEOPLE is excited to be a big brother.

He's "so ready to have a permanent friend," he shared in June.

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"He definitely loves pointing to Meghan's stomach and saying 'baby' and kissing her belly. So it's definitely a lot cuter than we ever thought," Sabara said.

Sabara also shared that Trainor — who experienced gestational diabetes in her first pregnancy — was "doing really well" and didn't get the same condition this time around.

meghan trainor/Instagram

"She is a trooper," said the actor. "The amount of things that she does pregnant, and just in general, I mean she's a superwoman. I just am in awe of her."

Daryl Sabara Instagram

Speaking with PEOPLE in April, Trainor said she and Sabara can't wait for Riley to have a sibling.

"I look at my husband and go, 'We are so lucky,'" said Trainor. "I'm the best version of me. Each kid's going to bring a new version of me that I think is going to be badass — so I need four, at least!"