Where do you get the song it's your wedding day on karaoke?

You can find "It's Your Wedding Day" on Karaoke platforms such as YouTube, Smule, or dedicated karaoke apps like KaraFun and SingSnap. Many karaoke machines also include this song in their libraries, so check the song list of your device. If you're using a karaoke streaming service, search for the song title directly to see if it's available.