WASHINGTON — Sarah Michelle Gellar paid tribute to the late Michelle Trachtenberg on what would have been her 40th birthday.

The "Buffy the Vampire Slayer" star shared a heartwarming post on Oct. 11 dedicated to Trachtenberg. The Instagram post was a short clip of Gellar and Trachtenberg hugging while the song "See You Again" played in the background.

"When you turned 16, it was hard not to still see you as the little girl I met on All My Children. 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," Gellar said in her caption . "This I know… it would be filled with love. Happy birthday @michelletrachtenberg ."

Trachtenberg, who played Gellar's onscreen sister on "Buffy the Vampire Slayer," died from compli

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