Justin Bieber's mom is "so excited" to be a grandma

Pattie shared a short video message on her own Instagram account, in which she said: "So I have been waiting for this day and now that they have shared it I can finally celebrate with ya'll.

"Oh my gosh, I'm going to be a grandma. Oh my goodness!

"Justin and Hailey you are going to be the best parents ever and I am so excited. Oh my goodness. Praise God."

Pattie, 49, also dec lared her heart to be "so full" due to the news.

She captioned her post: "BABY BIEBER IS ON THE WAY!! I'm gonna be a GRANDMA!! CONGRATULATIONS @justinbieber and @haileybieber !! My heart is so full. What an exciting new adventure. Love you so much!(sic)"

The couple's pregnancy announcement featured footage of Hailey, 27, and 30-year-old Justin - who got married in 2018 - renewing their wedding vows in Hawaii.

Among a series of behind-the-scenes snaps, the Rhode founder is seen wearing a white, lace dress that highlights her baby bump while the 'Peaches' hitmaker takes a photo of his wife.

A number of the couple's famous friends have congratulated them.

Mother-of-four Kim Kardashian wrote on Instagram: "I love you guys sooooo much!!!! (sic)"

Her half-sister Kylie Jenner - who has Stormi, six, and Aire, two, with Travis Scott - commented: "i love you guys!!!! ahhhhhhhh (sic)"

Elsewhere, Chrissy Teigen predicted that Hailey will become an "amazing mommy".

The 38-year-old model - who has four children with husband John Legend - wrote: "EEEEEEEEEEEEEEEEEEEEEEEEE!!!!!! You are going to be an amazing amazing mommy oh boy get ready!!! So exciting so happy for you both!! (sic)"