Kelly Ripa and Sarah Michelle Gellar pay tribute to late former All My Children co-star John Callahan

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“I want the world to know how much you meant to so many people," Gellar wrote on Instagram following Callahan's death Saturday at age 66. "He stepped into a lot of moments in my life because I didn’t have a father to be there." Ripa added in an Instagram post showing Callahan with his hand on her baby bump: "Because there are no words, all i can muster is Rest In Peace." ALSO: Ripa got emotional on Live remembering Callahan.