It's Justin Beiber's 30th Birthday Party, but fans are wondering how Hailey Beiber will act with her husband when she gets there at the party.

On a popular Reddit board, a fan created a thread titled: "30th Bday Predictions."

They went on to guess that although Hailey would be there, Justin would probably hang out with his friends the whole time.

"Hailey is going to try to cling on to him," they wrote.

The user went on to say that when the singer posts his "bday photo dump" he'll be smiling in the pictures with everyone except his wife.

In the pictures with her, the fan believes he'll "look mad."

The fan concluded: "She’s also going to post a bunch of old photos of them together.

"He won’t like or comment unless she takes his phone and does it herself."

Other users on the Reddit thread commented on the post to agree with the original user.

One said: "This is so spot on - you nailed down their exact formula.

"Although if Hailey sees this (she’s often on here) she’ll probably take his phone altogether and repost whatever she posts for his birthday.

"This is hilarious how easy it is to predict Justin and Hailey."

"She’ll be like… 'can’t wait for baby Bieber!!!' just to distract the public from how miserable he looks next to her," added another.

A third wrote: "30th Bdays are meant to be big.

"I’m sure she’s going to post about how she organized the whole thing to get the credit and the clout so that she can shut down the breakup rumors, even though she would probably not even lift a finger to organize anything."

Hailey's father has fueled speculation that her marriage with Justin is on the rocks.

Stephen Baldwin, 57, dropped a cryptic post about his daughter and son-in-law on his Instagram Stories on Monday.

In the post, film star Stephen directly referenced the couple by name.

Hailey's dad shared a video of pop music icon Justin singing a hymn and added a cryptic caption to the clip.