"I'm Your Girl"的詞曲創作是由流行女歌手蔡依林與著名音樂製作人Teddy Riley共同完成。以下是其歌詞：
(Chorus)
I'm your girl, you're my man
You're my baby, I'm your girl
Everyday, I'll be by your side
I'm your girl, you're my man
(Verse 1)
Baby, I'm your girl
And I will always be
Your girl forever
No matter what they say
(Chorus)
I'm your girl, you're my man
You're my baby, I'm your girl
Everyday, I'll be by your side
I'm your girl, you're my man
(Pre-Chorus)
Yeah, when you call my name
And say my name
And we're in a zone all of our own
(Chorus)
I'm your girl, you're my man
You're my baby, I'm your girl
Everyday, I'll be by your side
I'm your girl, you're my man
(Bridge)
And I know that we've been through a lot of things together
But I promise you, I will always be by your side
No matter what happens, no matter what they say
You know that I am your girl
(Chorus)
I'm your girl, you're my man
You're my baby, I'm your girl
Everyday, I'll be by your side
I'm your girl, you're my man
(Outro)
So don't let go, don't let go of me now
I know we've been through a lot of things together
But I promise you, I will always be by your side. 以上就是"I'm Your Girl"的完整歌詞。這首歌表達了蔡依林對愛情的堅定和執著，她願意成為男友的唯一，無論發生什麼，都會陪伴在他的身邊。