Reese Witherspoon Sends 'Big Sis' Jennifer Aniston the Sweetest Message on Her Birthday

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The actress also called it 'a gift' to work with her every day on 'The Morning Show.'

Happy birthday, Jennifer Aniston!

The Morning Show actress turns 54 today, and her costar Reese Witherspoon jumped at the chance to celebrate, sharing a sweet montage of the two of them behind the scenes on their hit Apple TV+ series.

The carousel of photos, posted on Instagram earlier today, Feb. 11, begins with a shot of the pair sitting in directors chairs, with Witherspoon leaning her head down to rest on Aniston's shoulder as they both smiled widely at the camera.

The next photo found the two of them standing on set together, Witherspoon smiling directly at the camera while Aniston looked distracted by something off to the side.

The third photo was a throwback photo of the pair at a Stand Up To Cancer event in 2014.

The next two photos also appear to be BTS shots from set, with the final shot finding them standing on a street corner, surrounded by several boom mics as they hugged one another.

"Happy Birthday @jenniferaniston!" Witherspoon wrote alongside the photos, sending her costar love on the big day. "What a gift to get to work with my big sis everyday on @themorningshow. You always give the best advice and endless LOVE and support. I 💖 you, Jen! Everyone wish her a Happy Birthday!! 🎂💫"

Fans were quick to heed her request with one sharing, "Happy birthday to Jennifer! She and the Friends gang helped me laugh each day some years ago via reruns when I was having chemo. Forever grateful!💚🎉✨."

"Happy Birthday Jennifer!!! I love the kind words about you from Reese!! Such a great friend you are! 🙌," said another.

"Happy Birthday Jennifer! 🎊🎉🎈You will always be fabulous! 💕," another message read.

Octavia Spencer also took a moment to wish the We're the Millers star "Happy birthday," while other fans gushed over the photos.

"Living for this content !!!!!" one wrote, and honestly, same! We love how genuine their friendship is. Is it time for Season 3 yet?!