The 28-year-old quarterback was seen in snaps posted by his 28-year-old wife on her Instagram on Monday, hours after the glitzy bash.
Just hours earlier, Mahomes had led his team to a 25-17 victory over the Cincinnati Bengals, which clinched the team’s eighth straight AFC West title.
The quarterback was wearing a black and white Amiri silk shirt that retails for just under $1K, with a backwards black trucker cap for the party.
He also rocked a diamond-encrusted necklace and a matching bracelet, while also accessorizing with a black watch.
Mahomes completed his look with black pants and black dress shoes as he partied with his wife, who he started dating back in high school.
His wife Brittany opted for a strapless black mini-dress that fell to her mid-thigh for the outing.
She also donned a white tiara that read Happy New Year while also accessorizing with silver hoop earrings.
The personal trainer also held a silver purse and completed her look with strappy black heels.
Brittany also took to her Instagram story, sharing a party snap with Mahomes kissing her cheek while the husband and wife posed with Brittany’s friend, Miranda Hogue.
Brittany has been making headlines of late after she seemingly solidified BFF status with Taylor Swift, who is dating Mahomes’ teammate Travis Kelce.
Swift was spotted boarding a private jet with Brittany earlier this month, flying from Kansas City to Wisconsin to watch the Chiefs play the Green Bay Packers.
The pop megastar was seen in a red teddy coat from Brittany, which she had been seen wearing on the sidelines of a previous game.
Taylor was spotted flashing a big smile as she made a grand arrival to Lambeau Field, with Brittany close by her side.
Along with sporting a long-sleeved, black shirt and a stylish miniskirt, the songstress added a red coat on top – which her new BFF has been seen wearing on various occasions in the past.
Swift and Mahomes have been spending time together since the star’s romance with the Chiefs tight end came to light.
Both Taylor and Travis joined Brittany as well as her husband Patrick for a festive Christmas bash in Missouri.