Fans think Hailey Beiber has just told off her husband for giving away her pregnancy.

Justin Bieber and the model were in attendance at last night's (September 13) Met Gala, returning this year for the first time since the pandemic.

While the couple was posing for the photographers on the red carpet, a detail caught the eye of some fans. Is Hailey the latest celebrity to keep her pregnancy under wrap?

Hailey And Justin Bieber Are Expecting Their First Child, Fans Guess

Hailey and Justin tied the knot in late 2018, after dating from 2015 to 2016 and following a brief split where she was linked to Shawn Mendes.

In a new video of them circulating online, the Baby singer poses for photographers lovingly cradling Hailey's belly, prompting speculations that she might be expecting a baby.

The short clip also shows the model seemingly telling Bieber off for such an unequivocal gesture.

Hailey also mouths something inaudible to Justin, leading fans to believe she is concerned photographers might think she is pregnant. After Hailey whispers something to her husband, he immediately removes his hand off her belly.

"Is she saying 'don’t make it obvious,'" one fan asked on celebrity gossip page @deux.discussions.

"it’s all i can see now!" one person replied.

"She’s not wrong!! Smart thinking on her," another said.

"J has been doing this hand placement for some time now. I think he’s shouting blanks to be honest not pregnant," another fan wrote.

"My guess is biebs shoots blanks and that’s why he’s so GD mad at everybody," another fan wrote.

Related: Jennifer Aniston Trolls David Schwimmer For Posing With Justin And Hailey Bieber

Celebrities Concealing Their Pregnancies On Social Media

If fan theories are true about the pregnancy, and congratulations would be in order if it is, Hailey Bieber would be the latest celebrity to keep her baby bump a secret.

Earlier this month, Kylie Jenner revealed she is expecting her second child with Travis Scott after having disappeared from the public eye. Olivia Munn also posted social media content without revealing she is expecting a baby with comedian John Mulaney.

Dating back to August 30, one of Munn's latest Instagram posts sees the actress posing in a shirt and pants, no signs of pregnancy.

While it's totally her decision to share the news when she feels it's appropriate to do so, some fans tried to spot some edited details in the picture in question. Some believe Munn was pulling a Kylie Jenner move while trying to keep her pregnancy under wrap.

"She's pulling a Kylie!" one Instagram user commented on @deux.discussion's post about her pregnancy.

Next: Fans Hope Britney Spears Just Hinted At Getting Pregnant Soon In New Insta Post