Kanye West is laying his feelings for girlfriend Kim Kardashian all out on the table ... and he's putting them in his lyrics, too!

The 34-year-old rapper is talking about putting his new ladylove in "a white dress."

In his single Mercy, Kanye raps:

    "I saw you in the club in a white dress/Now I want to put you in a white dress."

Could Kim actually be prepping to walk down the aisle again ... for reals?

This isn't the first time Kanye's rapped about Kim in his songs. In his single "Way Too Cold," West talks about being in love with the curvy 31-year-old reality star.

Talk about an open book!