Hailey Bieber, 27,  is already six months along in her pregnancy

Hailey Bieber, 27, is already six months along in her first pregnancy with husband Justin Bieber, 30.

The couple, who have been married since 2018, have confirmed they are due late summer, according to People.

And while the duo are just a few months away from welcoming the newest member of their brood, Justin’s mother, Patty Mallette, 49, has revealed that the pair will only be welcoming one tot – confirming that they are not expecting twins after sparking furious speculation when she shared a comment about ‘grand-babies’ on Instagram.

Looking back at the last few months, the pair had dropped several subtle clues that they might be in the family way before revealing the growing baby bump in a vow renewal video released Thursday on Instagram.

Justin’s mom made fans think the power couple were having twins.

It all came down when Justin’s mother replied to Hailey’s dad, Stephen Baldwin, 57, on his post about the addition to the family.

‘Congratulations Grandpa! WE ARE GONNA HAVE THE CUTEST GRAND-BABIES EVER!’ wrote the mom.

The use of the plural resulted in fans questioning just how many buns were in the oven.

‘@pattiemallette is there more than one baby twins?’ one fans asked. ‘@pattiemallette wait, babies????’ echoed another.

Mallette quickly clarified answering,’ No not twins lol I wish.’

‘I just mean in general,’ she continued. ‘Hopefully they will have more than one eventually.’

‘They will make beautiful babies whenever they have them. One is enough for now,’ she added.

The parents-to-be are already getting a nursery set up for the little one.

‘Everyone is excited for them,’ a source told the outlet.

‘They will be great parents, and Justin will be super involved. This will be the next important project for him.’

The insider went on to say the Yummy singer, who was mostly brought up by his single mother is ‘so excited to raise his baby.’

‘They have a name that they think is perfect,’ the source revealed.

‘They’re also starting to decorate a nursery. They can’t wait to meet the baby.’

The couple kept the news a secret from everyone except their closest circle.

Hailey’s uncle Billy Baldwin, 61, revealed he learned about the baby when most of the world did.

‘I just found out a couple of hours ago,’ the actor told the outlet at a special screening of Americans With No Address in Los Angeles Thursday.

The South of Hope Street star said he had texted his younger brother congratulations. ‘But this will be his second [grandchild] and I’m excited.’