"Happy"的歌詞由Hilary Duff演唱，以下是歌詞：
Verse 1:
Feel my feet hit the ground
With every step I take
It's like the sun came up
And I'm on my way
Chorus:
Happy, happy, happy
It's a beautiful day
Happy, happy, happy
I'm gonna dance today
Verse 2:
Feel my heart start to beat
Like a drummer in a band
With every beat I feel
More and more undone
Chorus:
Happy, happy, happy
It's a beautiful day
Happy, happy, happy
I'm gonna dance today
Bridge:
Cause when I look around
I see the world is mine
So I'm gonna live it up
Gonna live it up, oh yeah
Chorus:
Happy, happy, happy
It's a beautiful day
Happy, happy, happy
I'm gonna dance today
Outro:
Oh yeah, yeah, yeah, yeah, yeah
I'm feeling happy right now (x2)
Yeah, it's a beautiful day (x2)
Gonna dance all day (x2)
這是一首充滿活力和歡樂的歌曲，表達了作者對美好一天的熱愛和期待。歌詞中的“Happy”反覆出現，表達了作者的情感狀態和對生活的積極態度。