Hailey, the 27-year-old model, posted a video and a series of photos on Instagram showing off her baby bump.

Justin, 30, is also in the social media footage and has shared his wife's post. It racked up more than 1.8 million likes in less than an hour.

The announcement did not include a caption, with Hailey simply tagging her husband in the post.

The couple tied the knot in a secret ceremony in New York in 2018. The Instagram footage shows Hailey in a white lace dress during an apparent vow renewal held in a field.

Kendall and Kylie Jenner were among the celebrities congratulating the couple in the comments of Hailey's social media post.

US reality star and entrepreneur Kim Kardashian, model Gigi Hadid and TV personality Chrissy Teigen also commented with their warm wishes.

Hailey is the daughter of actor Stephen Baldwin and niece of actors Alec, William and Daniel Baldwin, while Justin was discovered as a singer online aged 13 and went on to become a pop sensation with his hits including Baby, Love Me and Yummy.

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The Canadian superstar was forced to cancel the remaining dates of his Justice world tour last year amid his ongoing recovery from Ramsay Hunt syndrome, a condition that can cause facial paralysis.

He unexpectedly stepped on stage at Coachella last month to perform the 2020 hit single Essence, alongside Wizkid, during a set by Nigerian star Tems.