Whats this song..."i saw her standing in the rain, raindrops falling on her, she didnt seem to care...?

Question

just sat there and smiled at ME. and i knew (oh yes i knew) she would make me happy.

another part goes "flowers in her...flowers everywhere!" (i think)

Answer 1

It's played by The Cowsills "The rain, the park and other things"

Answer 2

The Rain, The Park and Other Things by The Cowsills

And I knew (I knew, I knew, I knew I knew)

She would make me happy (happy, happy)

Flowers in her hair

Flowers everywhere