They don't know that we know they know we know...how epic this Friends reunion is!

Courteney Cox celebrated her 55th birthday at a dinner on Saturday with, wait for it, her Friends female besties, Jennifer Anistonand Lisa Kudrow.

"How lucky am I to celebrate my birthday with these two??? I love you girls. So much ♥️," Cox, who played Monica on the hit show, wrote on Instagram alongside a photo of the three.

"LOVE you girls! Happy happy Court," commented Kudrow, who played Phoebe.

Kudrow, 55, also wrote on her own page, "Just remembering Court, I will ALWAYS be older than you. HAPPY BIRTHDAY lovely Courteney!!"

"Only wiser my sweet," Cox replied. "Never older. I love you."

Aniston, who is 50 and who played Rachel, is not on Instagram.

Mutual friend, fellow '90s and '00s comedy legend and upcoming Comedy Central late-night talk show host David Spade also attended Cox's birthday dinner.

"Happy birthday to @courteneycoxofficial and her plus one. xx," he wrote, alongside a photo of the actress with Aniston.

Other guests included Sara Foster, Mary McCormack, and jewelry designer Jen Meyer.

The cast of Friends has remained, well, friends since the show ended its 10-year run in 2004, and the actors have occasionally been spotted together. See pics of the recent Friends reunion and check out some more:

Lisa Kudrow, Courteney Cox, Jennifer Aniston

Instagram/Lisa Kudrow

Courteney Cox, Lisa Kudrow, Jennifer Aniston, Friends, Reunion, Birthday

Instagram / Courteney Cox

Friends Reunion, Lisa Kudrow, Courteney Cox, Ellen DeGeneres Show

Michael Rozman/Warner Bros.

Courteney Cox, Jennifer Aniston

Kevin Winter/Getty Images

Jennifer Aniston, Courtney Cox

Getty Images

Courteney Cox, Jennifer Aniston, AFI Tribute to George Clooney

Kevin Mazur/Getty Images for Turner

Matt LeBlanc, Matthew Perry

Dave Benett/Getty Images

Friends, James Burrows Special

NBC

Friends Cast, Big Bang Theory Cast

Instagram

Courteney Cox, Matt LeBlanc, WGA

Alberto E. Rodriguez/Getty Images for Writers Guild of America

Jennifer Aniston, Courteney Cox

Angela Weiss/Getty Images for Darin Pfeiffer Consulting

Matthew Perry, Lisa Kudrow

Jason Kempin/Getty Images

Lisa Kudrow, Courteney Cox

Jeff Kravitz / FilmMagic

Jimmy Kimmel, Twitter

Twitter

Lisa Kudrow, Jennifer Aniston, Jimmy Kimmel Live

Randy Holmes/ABC via Getty Images

Matthew Perry, Courteney Cox, Cougar Town

ABC Studios

Courteney Cox, Matthew Perry, Go On

NBC

Courteney Cox, Jennifer Aniston, Cougar Town

ABC

Check out the surprising secrets of Friends' final season.

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