Hailey Bieber shot her new Saint Lauren promotion while four months pregnant with her and husband Justin Bieber's first child

She captioned the image: "Shot this four months preggy with little bean in my belly."

Even though Hailey hinted at her due date with her post, it is unclear when photographer Gary Sorrenti snapped the pictures to go with Saint-Lauren's collaboration with Ray-Ban.

Hailey appears to be already in her third trimester after she showed off her baby bump last month while sharing photos from her and Justin's vow renewal in Hawaii.

She also recently flaunted a huge new diamond ring said to be worth $1.4 million, which Justin is thought to have given her to mark the vow ceremony.

Hailey's photos on Instagram of the sparkler showed she appeared to have moved her original $600,000 engagement ring from Justin to her little finger of her other hand.

Gemologist Tenishia McSweeney from Prestige Pawnbrokers - which features in Channel 4's 'Posh Pawn' show - told Mail Online her new band is worth approximately $1.4 million.

She said: "Assuming Justin went for the finest colour and clarity grades which isn't a stretch considering her previous engagement ring which is in itself magnificent and now worn on her pinky now seems more yellow in comparison, and with the size looking to be around 10 carat you'd be looking at least $1.4 million."

As well as her new ring, Hailey was seen sporting an eternity wedding ring that matched her husband Justin's band.

Hailey's ring update sparked fan speculation it was her way of revealing she is expecting a girl - as her snaps also showed off her fresh pink cherry blossom manicure.

She captioned the post: "Little cherry blossoms on my nails little cherry blossom in my belly (shells and pink flower emojis.)"