Justin and Hailey Bieber fans have one very important question after they share new post

Justin and Hailey Bieber fans all have all been saying the same thing after spotting a missing detail in a set of holiday snaps.

The 30-year-old 'Baby' singer took to Instagram yesterday (16 December) to upload a series of pics of him and Hailey, 28, enjoying a night out at a beautifully picturesque Costa Rican wedding.

The couple, who welcomed their first child together, Jack, just four months ago, beamed in selfies as they celebrated their close friends Joseph Perez and Jessica Lageyre's special day.

Justin and Hailey Bieber celebrated their close friends' wedding in Costa Rica (Instagram/@justinbieber)

The photo dump featured dance floor snaps, the Rhode founder sitting down on a sofa looking fab in her simple yet chic wedding attire and the Biebers cosied up in a tight embrace.

Justin and Hailey, who tied the knot themselves back in 2018, welcomed baby Jack back in August with the new dad sharing a close-up snap of his son's foot, writing 'WELCOME HOME, JACK BLUES BIEBER' to announce the news.

Since then, fans have been glued to both Justin and Hailey's socials to catch a glimpse of the tot, which is a pretty rare occurrence for them, given how private they've been about their parenting journey since welcoming little Jack.

After seeing the Costa Rica wedding photos, fans rushed in to share their praises for the 'best couple of the century'.

"Couple goals," beamed one Instagram user.

A second chirped: "I'm so happy you're happy. This is all I want."

"Best couple of the century and forever grow old together," penned a third while a fourth chimed in: "Mommy and Daddy Bieber!"

However, amidst all the gushing comments from fans - many were confused as to where little Jack was.

Fans were wondering where little Jack was in the Instagram photo dump (Instagram/@justinbieber)

One Instagram user penned: "Where's the baby?"

"WHERE IS JACKKKKKK," quipped a second.

Another echoed: "Where is Jack?"

And a final fan demanded: "WHERE JACK COME LET ME SEE THIS KID."

Hailey has previously spoken out about her desire to raise her family out of the spotlight - which is something her own parents, Stephen and Kennya Baldwin, did.

However, she’s accepted that the attention is 'probably totally unavoidable'.

"That was before I was married," the Rhode founder told GQ last October. "Didn’t know who I was going to be married to at the time, I’m sure.

"Maybe I liked the idea at 18 of not raising kids around certain things, but my life is so different now than it was when I was 18.

"It’s so hard to say what I’m going to do or not do when there isn’t even a child here yet. I don’t even know what it feels like to be a parent other than a dog parent yet.

"And that’s not the same thing, by any means."