Plus, see her daughter Ava Phillippe's sweet birthday wish!
Reese Witherspoon has received a pretty overwhelming amount of birthday love.
The Legally Blonde star shared a sweet new snap of herself ringing in her 40th with friend Nicole Kidman, writing, "This is 40 ... I am one lucky gal."
WATCH: Reese Witherspoon Celebrates Her 40th Birthday With a Private Concert
Reese's 16-year-old daughter, Ava Phillippe, also joined in on the birthday fun and shared a sweet message for her mom, writing, "Happy birthday to this lovely woman! thanks for always being there to support me. have the best day."
Reese made sure to thank all her friends and loved ones in a birthday collage on Instagram Wednesday, with the caption, "Awww...Y'all are the sweetest!! ? THANK YOU SINCERELY for all the birthday love! ?? #MakingMeBlush."
WATCH: Chelsea Handler Wishes Reese Witherspoon a Happy Birthday With Nude Selfie
In support of the big 4-0, Reese has received a bonafide cavalcade of celebrity well-wishers and celebrators, from Chelsea Handler to Jennifer Aniston, Justin Theroux, Courteney Cox, Kate Hudson, Robert Downey Jr., Nicole Kidman, Keith Urban, Tobey Maguire, Jason Bateman and Matthew McConaughey, who attended the actresses' Hollywood birthday bash.
It's the kind of guest list that would even give Taylor Swift major squad goals, except, of course, the "Bad Blood" singer was there too to give a surprise performance.
Watch the video below.