Kansas City Chiefs star Patrick Mahomes is making headlines for signing a 10-year deal worth $500 million — but the 24-year-old Super Bowl MVP won’t be enjoying the fruit of his labor alone.

Celebrating on Instagram on Monday, the QB’s longtime girlfriend Brittany Matthews, also 24, bragged about his accomplishment, telling her half a million followers: ‘Let me tell y’all about my best friend, he earned that ish.’

High school sweethearts Mahomes and Matthews have been together for over eight years, with Matthews — a personal trainer and former soccer player — supporting Mahomes since the beginning, back when Mahomes was still playing high school baseball.

Like Mahomes, Matthews is from Whitehouse, Texas, where she was raised by mother Diana Massey and father Scott Matthews.

She attended Whitehouse High School, which is where she and Mahomes met and started dating as teens.

Their earliest Instagram photo together is from December 2011, in which Matthews sits on Mahomes’ lap and refers to his as her best friend — but the pair didn’t officially get together until March of 2012.

They were both heavily into sports in their high school days, with Matthews cheerleading and playing soccer and Mahomes doing both football and soccer.

In throwback snaps, she is seen cheering him on at games, wearing his jersey at a baseball game and referring to him lovingly as ‘my little pitcher.’

She was there as he excelled at football, too, rooting for him from the stands.

‘She has been supportive of me in whatever I do even before I played quarterback in high school,’ Mahomes told Utterly Patriots in 2016. ‘She has been my No. 1 fan since the beginning. Her support means the world to me.’

They also went to several school dances together, including prom. Old photos show baby-faced Mahomes and Matthews posing together in formal attire, including for prom in 2013, when Mahomes matched his teal bowtie to Matthews’ shoes.

The two transitioned to a long-distance relationship during college, when Matthews went just 20 minutes away from home to UT Tyler, where she studied kinesiology. Mahomes, meanwhile, went to Texas Tech, which is 400 miles away in Lubbock.

But they continued to support one another and text often, especially on games days.

Matthews continued her athletics in college, playing for the school’s soccer team. There, she earned all-region honors after her senior season and is second all-time in program history with 78 points and her 31 goals, according to the The Morning Telegraph.

‘I am extremely proud of the level of play she has gotten to because all of it is from hard work,’ Mahomes told Utterly Patriots. ‘Her competitive nature is one of the many things I love about her. She hates losing and wants to be the best. She works extremely hard to be great and it inspires me to work just as hard.’