All the Details from Justin Bieber’s ‘Relaxing’ 31st Birthday Getaway with Wife Hailey and Baby Jack (Exclusive Source)

Justin Bieber had a low-key birthday this year.

A Bieber source tells PEOPLE exclusively that he and wife Hailey Bieber had a “fun, relaxing getaway” with friends at Gozzer Ranch in Coeur d’Alene, Idaho, to celebrate his 31st birthday — and their 6-month-old son Jack Blues was with them.

The source adds that the couple are doing “great” despite being constantly hounded by divorce speculation.

“No matter what the rumors are, they are fine,” the source says. “Their marriage is fine. They’re very happy together.”

On March 1, Justin shared a rare look at his life as a new dad, as he posted an adorable snap of himself, the 28-year-old Rhode founder and their son.

The photo, part of a celebratory Instagram carousel post filled with birthday snaps, featured Justin lifting up his son as he and Hailey stared sweetly at Jack.

In the snap, their son could be seen wearing a cute green onesie and a beanie as well as tiny white socks.

Elsewhere in the post, Justin gave fans an inside look at his latest birthday celebration as he smiled alongside several of his closest friends and cozied up with Hailey on the floor of a home.

The model also posted a short-and-sweet 31st birthday tribute to her Instagram Stories in celebration of her husband’s big day.

In the photo, Hailey could be seen in grey sweats and a knit hat as she hugged Justin from behind, while he seemingly recorded some music and sang into a microphone.

Behind Justin’s buzzcut, their room was adorned with a trio of “happy birthday” balloons, signifying the “Never Say Never” singer’s latest trip around the sun.

“31❤️‍🔥,” Hailey wrote over the image.

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Ahead of Justin’s birthday post, plenty of friends and loved ones shared their well-wishes on Instagram Stories, including The Kid LAROI, Justin’s half-sister Jazmyn and singer-songwriter Eddie Benjamin, who called his friend “a person of compassion and truth for many.”

In Jazmyn’s post, she shared a throwback image of the pair from around 2011, complete with an Instagram filter true to the era.

“happy birthday,” she wrote, alongside a white-heart emoji. “love you tons.”

Some of Justin’s longtime pals also shared some behind-the-scenes looks at the birthday celebration on Saturday, March 1.

In photos shared by longtime friends Maejor, Khalil and Lil Za, Justin could be seen surrounded by pals during the daytime hangout featuring drinks, golf carts and a guitar.

According to his friends’ Instagram Stories, Cole Bennett, Kyle Massey, Benjamin and others appeared to be in attendance, as well.