Exclusive to couples "Azzy" & "Marc3line", and "Rando" & "Fruitloop", who met in Rocket League and got married.

Source:
https://www.reddit.com/r/RocketLeague/comments/hvvtit/flabbergasted_thanks_psyonix_for_the_coolest/
https://twitter.com/RandomizedHero/status/1277789706164424704