Prior to her husband Patrick Mahomes’ extravagant 𝐛𝐢𝐫𝐭𝐡day celebration, Brittany Mahomes quickly changed her attire. The soon-to-be mother of three changed her old Chanel minidress for a Givenchy halter neck dress on Sunday night after the Chiefs’ thrilling victory over the Bengals.

Wearing a navy-and-white striped dress ($1,300), Brittany flaunted her developing 𝑏𝑎𝑏𝑦 belly and accessorized it with minimal jewelry.

The blonde beauty removed her Chanel pearl necklace and exchanged her Chanel-branded loafers for a pair of platform Prada shoes ($1,120), all while maintaining her hair in the same updo inspired by Pamela Anderson.

8Brittany Mahomes changed into a striped Givenchy dress for husband Patrick Mahomes’ 𝐛𝐢𝐫𝐭𝐡day party on Sunday.randimahomes/Instagram

8She wore a chic Chanel look earlier in the

In order to give fans a better peek at Brittany’s understated style, her mother-in-law, Randi Mahomes, posted a family snapshot from her son’s 29th 𝐛𝐢𝐫𝐭𝐡day.

The 𝐛𝐢𝐫𝐭𝐡day 𝘤𝘩𝘪𝘭𝘥 elevated things with a Louis Vuitton monogrammed tee, while the most of the Mahomeses wore relaxed white T-shirts.

The NFL player wore the patterned top with matching sneakers and tan checkered pants. He had on the same “fit” earlier in the day, before the big game.

After the team won 26–25, Patrick hosted his close friends, family, and teammates at his opulent house, which included a basketball court, a 50-yard football field, a putting green, and other amenities.

8The halter neck dress retails for $1,300.

8The WAG also swapped her Chanel loafers for a pair of pricey Prada Sneakers.

Prior to the celebration, Brittany gave fans a behind-the-scenes glimpse at some of the over-the-top decor.

The moment guests arrived, they were greeted by a big balloon arch in black and red that said “Patrick’s 29th.” The quarterback’s insignia was also incorporated into the décor by the newlyweds.

A mirrored “29” and silver balloons draped with red LED lights adorned the entrance door.

Instead of a 𝐛𝐢𝐫𝐭𝐡day cake, guests ate Patrick’s enormous cookie cake and drank from bespoke mugs featuring his face.

8Mahomes wore her hair in the same ’90s-style updo all day.brittanylynne/Instagram

8The Mahomeses hosted their friends and family after their win against the Cincinnati Bengals.brittanylynne/Instagram

The football player’s old pictures were blown up and scattered about the estate.

For the celebration, the couple also rented a picture booth, which seemed to be popular with all of the attendees, including Taylor Swift.

The 34-year-old pop sensation posed for a couple goofy photos with Chariah Gordon, the fiancée of Chiefs wide receiver Mecole Hardman, and Sheawna Weathersby, the wife of defensive player Chris Jones, at the soirée.

8The couple went all out for the 𝐛𝐢𝐫𝐭𝐡day bash.brittanylynne/Instagram

8The party was complete with personalized drinkware.brittanylynne/Instagram

The “Fortnight” singer cuddled close to the other WAGs in the photos posted to Weathersby’s Instagram Stories, donning red cat-eye sunglasses for the occasion.

Swift seems to have stayed in the vintage Chiefs T-shirt outfit she wore to Arrowhead Stadium earlier today, even if Brittany changed for the celebration.

The hitmaker accessorized the red top with shockingly inexpensive jewelry, a black Louis Vuitton pocketbook, and thigh-high black boots.