A representative for Hailey Bieber confirmed to the Associated Press on Thursday that the model is just over six months pregnant.
The couple announced the news on their respective Instagram pages with corresponding posts.
Both begin with a short, romantic video clip of the couple kissing.
Hailey Bieber is draped in white lace; baby bump prominent in the sheer, form-fitting fabric.
It is followed up with a photo shoot of Justin Bieber photographing his wife.
In each caption, they've tagged one another.
In a press release, fashion house Yves Saint Laurent says the video and photoshoot are from the Biebers' vow renewal ceremony on Thursday in Hawaii.
In 2018, the Biebers confirmed their long-rumoured marriage on Instagram, when the musician posted a picture of the pair holding hands and captioned it, "My wife is awesome".
Hailey changed her username from "Baldwin" to "Bieber" at the same time.
They were engaged in the Bahamas earlier that year, after about a month of dating.
In addition to modelling, Hailey Bieber is the founder of skincare line Rhode.
Justin Bieber, who rose to fame as a teenager, is a Grammy winner with eight No. 1 songs under his belt, including Sorry, Love Yourself, What Do You Mean? and Despacito.
His last album, Justice, was released in 2021.
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