Meghan Trainor and Daryl Sabara Welcome Baby No. 2, Son Barry Bruce

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 ??."

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!! ????????."

Related: Pregnant Meghan Trainor's Son Riley, 2, Cheers as He Helps Reveal the Sex of Baby No. 2: Watch

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.

"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.

"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."

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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!"

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