Mallette, who raised the pop star, 30, mostly as a single parent in Toronto, posted a clip in which she told her 1.7 million followers that she’s ‘so excited’ to be a grandparent.

Mallette, who welcomed the Love Yourself singer with Jeremy Bieber, 48, in March of 1994, beamed over the welcome news as she sat in a vehicle.

Justin Bieber’s mother Pattie Mallette, 49, celebrated amid news the pop star and wife Hailey Bieber are expecting their first child

The proud mom and grandma-to-be said on Instagram Stories, ‘I’m gonna be a GRANDMA!!

‘So I have been waiting for this day and now that they have shared it I can finally celebrate with y’all,’ she said. ‘Oh my gosh, I’m going to be a grandma – oh my goodness … oh my goodness – praise God.’

She predicted that the pop star and model were ‘going to be the best parents ever.’

In the clip, Mallette wore her brown locks down and parted with a black floral pattern dress.

Mallette received birthday wishes from her daughter-in-law last month in an Instagram Stories post.

‘Happy birthday to my beautiful Mama in law,’ Hailey, the daughter of Stephen Baldwin and Kennya Baldwin, said April 3. ‘Having another amazing Mom is all anyone could ask for.’

Justin broke the news to his 290 million followers on his Instagram page on Thursday with an image and video revealing his 27-year-old spouse’s baby bump.

Hailey reposted the clip, which was filmed when the celebrity couple renewed their wedding vows in Hawaii.

Hailey’s rep told People that she is ‘just over six months pregnant.’

Mallette posted a video in which she beamed over the welcome news as she sat in a vehicle

Mallette told her 1.7 million followers that she’s ‘so excited’ to be a grandparent

In the clip, Mallette wore her brown locks down and parted with a black floral pattern dress

Mallette predicted that the pop star and model were ‘going to be the best parents ever’

Mallette raised the pop star, 30, mostly as a single parent in Toronto

Mallette posed with Justin and Hailey at an event in LA on January 27, 2020

Jeremy Bieber had not commented on the news as of Thursday afternoon on his Instagram account, on which he has 2.2 million followers.

The Hollywood couple was congratulated upon making their big announcement by a number of fellow celebrities.

They included Demi Lovato, Kim Kardashian, Kendall Jenner, Kylie Jenner, Kaia Gerber and Maddie Zeigler, among others.