Patrick Mahomes and pregnant fiancée Brittany Matthews celebrate Christmas in matching onesies

Patrick Mahomes/Instagram Brittany Matthews, Patrick Mahomes

Patrick Mahomes and Brittany Matthews celebrate their last Christmas before becoming parents!

On Friday, the couple shared photos from their Christmas morning wearing matching Coors Light onesies.

“Merry Christmas🎄,” Mahomes, 25, captioned his Instagram post, sharing a photo with Matthews and their dogs Steel and Silver. Another photo showed the longtime couple posing in front of their Christmas tree, with the football star lovingly cradling his fiancée's baby bump. (The couple is expecting a girl.)

Another photo showed Mahomes and his brother Jackson smiling at the camera.

Matthews, 25, shared the same photos with her fiancé as well as a snap with her future brother-in-law and wrote in her caption: “Merry Christmas everyone🎄💚❤️”

Patrick Mahomes/Instagram Brittany Matthews, Patrick Mahomes

RELATED GALLERY: The cutest photos of Brittany Matthews' baby bump

Earlier this month, Matthews celebrated a baby shower with close friends and family. Although Mahomes was not in attendance, he left a sweet message for his bride-to-be.

“I hope you have a great time at your baby shower and that everything turns out the way you dreamed it would,” the quarterback said in a video message for the occasion. “You will be the best mommy ever and I hope I can be just as good a dad.”

Matthews announced her pregnancy on Sept. 29 with an Instagram post that featured two photos with her fiancé, holding up a ultrasound picture while Mahomes hugs her belly.

Patrick Mahomes/Instagram Jackson Mahomes, Patrick Mahomes

Brittany Matthews/Instagram Jackson Mahomes, Brittany Matthews

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“Mommy and daddy are taking a little detour to the wedding❤️,” Matthews wrote at the time. The Super Bowl champion shared a close-up photo of the ultrasound image on his own Instagram feed and captioned the post with a red heart emoji.

The longtime couple, who began dating in their teens, became engaged earlier this month when Mahomes proposed following the Chiefs' Super Bowl ring ceremony and one day after Matthews' birthday.

Earlier this month, Matthews, a personal fitness trainer, wrote about wellness tips and advice she received during her pregnancy.

Brittany Matthews/Instagram Brittany Matthews, Patrick Mahomes

RELATED: Pregnant Brittany Matthews cradles her belly in photo with 'baby daddy' Patrick Mahomes

“One of the most important lessons I've learned from pregnancy is: GIVE YOURSELF A LITTLE GRACE!!!” the fitness coach wrote on Instagram last week, sharing a series of videos of herself demonstrating leg and shoulder exercises. “Understand that your body is changing, a whole person is growing inside of you, so don't be so hard on yourself!”

“The number of weekly workouts I do varies every week, and sometimes I don’t workout at all, and that’s OK!” she said, adding that her top “priorities” are “just moving, drinking water [and] Eat the right amount of calories.”

The mom-to-be regularly shares videos of her workouts and fitness tips with her Instagram followers and even did so on Christmas Eve.