Alan Thicke is already missed.
Hollywood is shocked by the Growing Pains alum's sudden passing. The actor's life was tragically cut short at the age of 69, after he succumbed to a heart attack on Tuesday.
A-listers like Ellen DeGeneres, Demi Lovato, Olivia Munn, and so, so many more took to social media to express their grief, share their condolences, and reflect on their fondest memories of the famous father.
You can see the emotional reactions (below):
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