Celebrity Jennifer Aniston Jennifer Aniston Posted a Throwback Photo From 'Friends' for Reese Witherspoon's Birthday The one where it's Reese's 46th birthday. By Tessa Petak Tessa Petak Instagram Tessa Petak is a Brooklyn-based writer who helps to cultivate InStyle's illustrious news coverage across a wide range of topics including celebrity, fashion, and entertainment. She also produces and composes celebrity profiles and features for the site and InStyle's digital issues. InStyle's editorial guidelines Published on March 22, 2022 @ 11:58AM Pin Share Tweet Email Photo: Getty Images Jennifer Aniston is celebrating her "sister" Reese Witherspoon's 46th birthday with a sweet Instagram tribute that includes some throwbacks of the two eternally youthful actresses. On Tuesday, Jennifer wished her The Morning Show co-star a happy birthday with a gallery of images — the first of which is an old photo from Reese's time as a guest star on the insanely popular '90s show Friends (in case you didn't know, Reese played Jill Greene, the sister of Jennifer's character Rachel Greene). The photo shows the two women in character from the episode titled "The One with Rachel's Sister," which aired in 2000. Rachel introduces Jill to her friend group during a visit to her New York City apartment. Jennifer Aniston Celebrated Her 53rd Birthday with the Most Chaotic Pair of Pants The other slides include a selfie with their The Morning Show producer Kristin Hahn, a sweet photo with Reese's hand on Jennifer's shoulder, and a behind-the-scenes video from the set of the Apple TV+ show. "It's somebody's birthday today 🥳," Jen captioned the gallery. "My little sister 👉🏼 co-anchor 👉🏼 partner in crime 🥂 I LOVE YOU, you sweet ray of sunshine. Let the love pour in! ❤️ Happy BIRTHDAY @reesewitherspoon 🥰🎂." During an appearance on Jimmy Kimmel Live! last year, Aniston told Kimmel that the times when her character Alex Levy and Reese's character Bradley Jackson fight, it's hard to stay mad. "It's always fun to fight with Reese because she's such a sweet burst of sunshine that she's, you know, not someone you wanna go scream your head off to," she explained. "And I usually always end up bursting into laughter at some point. It's just too hard to be that mad with each other. But we do it."