This is Sarah Michelle Gellar. You probably know her from her various film and television roles — Cruel Intentions, I Know What You Did Last Summer, Scooby Doo...
...but you undoubtedly know her best as Buffy Summers, Vampire Slayer, Chosen One, and Class Protector on Buffy the Vampire Slayer.
And this is Michelle Trachtenberg. You also probably know her from her various film and television roles — Harriet the Spy, Gossip Girl, 17 Again...
...but you definitely know her best as Dawn Summers, Buffy's little sister, The Key, and Member of the Scooby Gang on Buffy the Vampire Slayer.
And today, for her 31st birthday, Michelle got a very special birthday wish from her TV big sister.
Complete with a Buffy-centric joke:
#happybirthday @michelletrachtenberg It's obvious to all of us, that you have found the "key" to not aging (lol see what I did there??) Btw why did we wear so much more makeup when we were younger?? Just asking.
And to celebrate her own birthday, Michelle posted a picture of the world's oldest living cat, who shares her birthday.
They both turn 31 years old on the same day.
October 11th....I and the oldest living cat in the world are officially 31 years old. We're both thrilled and ready to party. Or take a really long nap #meow 😂😻🎂🎉 #libra #birthday 🦄