Pakistan, April 14 -- Sarah Michelle Gellar is marking a bittersweet birthday this year. The Buffy the Vampire Slayer alum shared a tribute to her late friend Shannen Doherty on the Charmed alum's 54th birthday April 12. It marks the first since her 2024 death and comes two days before Sarah will turn 48. "For as long as I can remember, we have celebrated our birthdays together @theshando," Sarah wrote on Instagram alongside a pic of the actresses at their 2024 celebration. "This year I will keep that tradition and celebrate you. I am so glad we were all together on this day last year, not knowing it would be the last like this. Happy Birthday Shannen." The Dexter: Origin Sin actress also shared a never-before-seen video of the two blowin...