Kanye arranged for the famous saxophonist to serenade his wife with a special V-Day performance in their living room -- sans furniture ... and Kim is loving every minute of it!

Sure, the sweet sounds of Kenny G on the sax are amazing ... but perhaps even more impressive are the dozens and dozens of leafless multi-colored roses filling out the room. Way to go, Ye!

Kim is giving it up to her man for the over-the-top surprise, handing him the best husband award for what she says is one of Kanye's most "thoughtful gifts ever!!!!"

That's a hard act to beat. Lovers, take note.