《Best Friends》的詞曲由蔡依林完成，歌曲的中文版由方文山填詞。
英文版歌詞如下：
Verse 1：
We've been through rain， thunder and snow
We've been through it all， together
Through the highs and lows， we've been there all along
Chorus：
Best friends， through thick and thin
Forever in my heart， they'll always be a part of me
Best friends， no matter what they say
I'll always remember， the memories we made
Verse 2：
Through the tears and laughs， we've been there for each other
Through the ups and downs， we've been there for each other
No matter what they do， they can never take that away from me
Chorus：
Best friends， through thick and thin
Forever in my heart， they'll always be a part of me
Best friends， no matter what they say
I'll always remember， the memories we made
Bridge：
They may not be around forever
But my best friends will always be in my heart
I may grow up and move away from here one day
But my memories will always stay with me
Chorus：
Best friends， through thick and thin
Forever in my heart， they'll always be a part of me
Best friends， no matter what they say
Yeah， they're my best friends forever more
以上就是《Best Friends》的歌詞，是一首表達友誼的歌曲。