Is it just us, or has 40 never looked so good?!
While the location remains top-secret, the actress appeared to enjoy a delicious glass of wine with a plate of food that lit up the room, literally!
"This is 40," she shared on Instagram Tuesday night. "I am one lucky gal."
Perhaps the cherry on top to this evening out comes with the special guest who couldn't help but join the birthday girl in the festivities. If our eyes aren't playing tricks on us, we say that's Nicole Kidman!
In addition to producing the upcoming series Big Little Lies, the duo has enjoyed a longtime friendship that has been evident at awards shows and various sets.
In fact, Nicole and husband Keith Urban were just some of the many A-list stars in attendance for Reese's party at Warwick this past Saturday in Hollywood.
Kate Hudson, Jennifer Aniston, Courteney Cox, Robert Downey Jr. and Tobey Maguire were just a few of the familiar faces who enjoyed a night full of dancing, jazz music and a surprise performance from Taylor Swift .
"Everyone was seen having a good time, goofing around and having fun," a source shared with E! News. "Taylor, Kate and Reese had a moment where they hugged each other."
Back at home, Reese received plenty of love from her family including a special message from her daughter on Instagram. "Happy birthday to this lovely woman!" Ava Phillippe wrote with a picture of her mom playing in the grass with her son. "Thanks for always being there to support me. Have the best day."