The two women were both in attendance for Monday's event, which took place at the Chinese Theater to celebrate the upcoming series featuring Cox, Greg Kinnear, Mira Sorvino and more.
Cox, 57, reposted a series of snaps from the event to her Instagram page on Thursday, March 3, including a shot of her with Kudrow, 58, who played the beloved character Phoebe on the hit NBC series.
"Had a great time at the premiere of @shiningvalestarz!" Cox wrote alongside her post on Thursday. "I love this show. Airs this Sunday on @starz."
In the photos, the Scream actress looked sultry in a black dress paired with simple layered gold necklaces, while Kudrow kept things classy with a striped blouse and black slacks.
The reunion comes in the wake of reports that the Friends cast members are fearful over Matthew Perry's upcoming memoir, which is set to drop later this year.
As OK! exclusively reported, Perry's book, Friends, Lovers and the Big Terrible Thing, is expected to be filled with shocking details about his struggle with substance addiction, his relationship with his castmates and more.
"The world is he's going to unload on the whole crew, which has everyone in a panic," the source dished, noting that Perry "figures it's time to come clean not just about his own life, but also about the good, the bad and the ugly things that happened on the Friends set."
The comedian, 52, reportedly "couldn't care less" about how the rest of the cast — which also includes Jennifer Aniston, David Schwimmer and Matt LeBlanc — might take the news, as he has no plans "to hold back."
The insider also told OK! that Perry often felt left in the dust by the rest of the gang, stating: "They weren't as close as people think. Their characters were so tight, but the reality is there was a lot of tension and jealousy."
"Matt seemed to be the odd man out," the source added before insisting: "Matt's memoir has the whole squad sweating bullets."