Jack Osbourne marked his 36th birthday.MORE: Sharon Osbourne surprises fans with romantic wedding photoIn honor of the happy occasion, his proud mom Sharon took to Instagram to share a throwback photo of her youngest child - and he looks so different.WATCH: Sharon Osbourne’s kitchen inside her $12million mansion is like an American dinerThe image sees Jack as a toddler, holding his teddy bear and sitting next to his rock star father Ozzy.
With his cropped blonde hair and big brown eyes, the star looks adorable in the family photograph.READ: Sharon Osbourne has the sweetest reaction to Amanda Kloots' DWTS debutMORE: The Talk hosts' unbelievable homes: Carrie Ann Inaba, Amanda Kloots and more"HAPPY BIRTHDAY to the cutest @jackosbourne!
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