(NEXSTAR) – Sarah Michelle Gellar, the star of TV’s “Buffy the Vampire Slayer,” shared a sweet message to her late co-star Michelle Trachtenberg on what would’ve been the latter’s 40th birthday.

In the post, shared on Oct. 11, Gellar remembered her and her on-screen sister’s relationship during their time on “Buffy,” after having appeared on the same soap opera as child actors years before.

“When you turned 16, it was hard not to still see you as the little girl I met on ‘All My Children,’” Gellar wrote in the Instagram post. "When you turned 21, I had to teach myself to not see you as the little sister anymore. I can’t imagine what 40 would have been like. This I know… it would be filled with love. Happy birthday @michelletrachtenberg.”

A video accompanying the message contained a clip

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