Jack Osbourne and his fiancée Aree Gearhart are expecting their first child together.

Jack Osbourne is be a father for a fourth time

Jack Osbourne is be a father for a fourth time

The 36-year-old star - the son of Ozzy and Sharon Osbourne - took to Instagram to reveal he and his significant other are expecting a baby this summer.

Jack - who has three daughters, Pearl, nine, Andy, six, and Minnie, four, with his ex-wife Lisa Stelly - wrote: "Exciting news!!! @seecreature and I are expecting a baby in the summer! Baby #4 here we come! (sic)"

Aree revealed finding out she and Jack are to be parents together was the perfect 31st birthday present.

She wrote: "today is my birthday, but my gift doesn’t arrive till summer ;-) new member of our tribe coming summer 2022. (sic)"

Jack's sister Kelly Osbourne was among the stars who congratulated the couple.

She commented on Aree's post: "You’re a nimbly bimbly kitty cat who’s heart is pure and true. Cause you’re a nimbly bimbly kitty cat who’s now eating for 2!!!!!!!!!!! Yes you’re a nimbly bimbly kitty cat and that’s why I love yooooooou……. Outside of you and jack there is no one more excited for this baby and you know why!!!!!!!! (sic)"

In late December, Jack revealed he had popped the question to Aree over the festive period, and she was delighted to accept his proposal.

He wrote on Instagram: "Today I asked the most beautiful and loving woman I’ve ever met to marry me. She said yes!! Life is a series of doors and I’m so excited to walk through this one with her. (sic)"

Jack praised interior designer Aree as a "magical being" and said seeing her be a step-mother to his three children makes his heart "so full".

He added: "She’s truly a magical being with a heart bigger then anything I could have imagined. Her step-mom skills make my heart so full. I couldn’t be happier then I am right now."

Aree shared the same picture of the couple, which saw her hand, featuring her engagement ring, placed on Jack as he snapped a selfie of them in a wintery setting.

She added the caption: "today my best friend asked me to marry him in a magical winter wonderland. i’ll love you forever and then some @jackosbourne . my soulmate, my adventure partner, my protector. i’m ready for forever w you + our tribe. (sic)"

Jack's sister Kelly commented: "I’m so so so beyond happy!!! Now we really are sisters!!!! I love you so much. Welcome to the family!!!! (sic)"