"Knowing that @JenniferAniston is in the world makes me happy! Her love of life, her humor, and her endless positivity are such a gift. Let's all wish Jen Happy Birthday! 🎈🎂🎁," Witherspoon emphasized.
All of the well wishes from her pals may have been heaven sent after the California native had quite a tough year. As OK! exclusively reported, Aniston has had her "loneliest" year yet.
"She seemed to be sad about something and was far from her usual bubbly self,” a source dished about her vibe on the set of Murder Mystery 2 in Hawaii. “It was like she had the weight of the world on her shoulders.”