Witherspoon was clearly impressed, responding: "#1 Best Birthday Message."
In addition to Garner, Witherspoon's Big Little Lies co-star, Nicole Kidman, also wished her a happy birthday on Instagram, writing: "My beautiful Reese, you are a friend, a partner, a leader, an inspiration and I love you. And you make me laugh like nobody else. Happy Birthday Xx."
Grateful for all the birthday messages, Witherspoon posted to Instagram: "Cake for breakfast, anyone? Thank you for all the sweet birthday wishes! Feeling so much love today! I’m one lucky gal 💖🎂🎈(@draperjames even made me this birthday dress! 😍) Thank you thank you!"
Witherspoon is also really good at birthday wishes! For Garner's 45th birthday last April, she shared a candid photo of her friend, writing: "Here's lookin' at you, Jen! Happy Birthday to my gorgeous friend #JenniferGarner who always laughs at my jokes and my bad dance moves! 👯😂 Love you!"
Garner not only kills it on Instagram, she also recently became a meme after her appearance at the Oscars.
"I can’t look at it. I can’t. What am I doing?" she said on The Ellen DeGeneres Show when asked about her concerned face at the awards ceremony. "What is wrong with me? I want to just punch her in the face."
Admitting she had no clue what she was thinking in that moment, Garner added, “I wish I did. I wish I had a better story about it.”
Prior to her Ellen interview, Garner did take to social media to joke about her possible thoughts. Check it out: