8:53 AM PT -- Brittany is sharing some more behind-the-scenes looks from the couple's special day, saying, "On a day that was meant to celebrate you, you turned it into celebrating us."
"You made this day perfect, you took my entire breath away and I could not have imagined anything better.
"Cheers to spending our lifetime together and an inseparable bond."
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Patrick Mahomes wasn't the only one in his household to get a massive ring on Tuesday ... the superstar QB just proposed to his longtime GF, Brittany Matthews, with a diamond that's bigger than her knuckle!!!
Mahomes surprised his lady with a floral arrangement and bright signs at Arrowhead Stadium in Kansas City after getting his Super Bowl ring ... and Brittany's ring might be even more impressive.
Since 24-year-old Mahomes just signed the fattest contract in NFL history -- he signed a $503 MILLION extension -- it shouldn't come as a surprise that he splurged on the jewelry.
Unclear on how much he paid for it, but by the looks of it ... it wasn't cheap.
Of course, the couple has been together since their high school days ... and have been pretty much inseparable ever since.
25-year-old Matthews -- a pro fitness trainer -- has been one of Mahomes' biggest supporters since day one and definitely made sure fans heard her cheers all throughout the Chiefs' Super Bowl run this past season.
Speaking of ... Mahomes and his Kansas City Chiefs teammates finally got their championship rings for the 2019 season just before the proposal ... and they're pretty spectacular.
The champs held a special social-distanced celebration on the Arrowhead Stadium field on Tuesday ... receiving their rings for their Super Bowl LIV win over the San Francisco 49ers.
The rings -- made by Jostens -- feature the Chiefs logo (made of 60 diamonds) and 2 Lombardi trophies (made with marquise-cut diamonds) on the top ... and includes 16 rubies to signify 10 AFC West Division titles and 6 playoff appearances under head coach Andy Reid.