Courteney Cox pays tribute to her best friend Jennifer Aniston on her 55th birthday. “Happy birthday my Jenny Louise.

I don't know why I call it that... But what's certain is what you like.” Earlier in the day, Aniston celebrated her own birthday on her Instagram account with a montage of photos of her from age 1 to age 55, accompanied by a caption: "Grateful" Below, the poem “Diapers” by Stanley Kunitz which begins with the very telling sentence which could have been written to recount the life of the actress herself.