Patrick and Brittany Mahomes were among the stars who descended on Kelce Car Jam to celebrate Travis Kelce's birthday on Saturday night.
The Chiefs quarterback is close friends with his tight end, while Brittany has formed a tight bond with Kelce's girlfriend Taylor Swift over the past year.
The couple were greeted by dozens of fans as they arrived at the charity event in Kansas City.
Patrick and Brittany were there to show their support at the second annual Kelce Car Jam, a showcase of swish cars belonging to the Chiefs star and his friends.
Proceeds from the charity block party are going to Kelce’s 87 & Running Foundation which raises funds for children in Kansas City and Cleveland.
Kansas City Chiefs quarterback Patrick Mahomes arrives at Kelce Car Jam on Saturday night
Mahomes and his wife Brittany were among the stars who descended on the charity event
A throng of fans followed Kelce after he arrived at his event on Saturday night
Kelce and Mahomes will return to the field on Monday, when the Chiefs take on the New Orleans Saints at Arrowhead Stadium.
It will be the first time Jason Kelce has called a game involving his younger brother since the former Eagles center joined ESPN as an NFL analyst.
Jason and his parents, Donna and Ed Kelce, arrived at the charity event shortly before Mahomes. Kansas City defensive end George Karlaftis was also spotted at Kelce Car Jam.
The family were spotted earlier on Saturday afternoon, having arrived in Kansas City to join Travis on his 35th birthday.
The Chiefs tight end, who turned 35 on Sautrday, speaks to the crowd in Kansas City
Patrick and Brittany Mahomes arrived at the charity event in a black Ferrari (pictured)
Patrick and Brittany Mahomes arrived in a black Ferrari but Kelce planned to show off the 1970 Chevrolet Chevelle that he famously drove Swift around Kansas City in last year.
'This year is the second year we've done a car show, basically a block-party style event, that will showcase some of the city's top automobiles from the Fuel House, a fun car club out here,' Kelce said.
'And then I guess a bunch of others that are lined up. It's gonna be fun. I should have my old school '70 Chevelle all revved up and ready to rock and roll. If not, I'll bring one of the other cars that I have.'
Kelce and Swift have been on several double dates, including at last month's US Open final, when the two couples watched Jannik Sinner beat Taylor Fritz in the men's final at Flushing Meadows.
Travis' older brother Jason Kelce flew in to support his brother at the charity event on Saturday
Donna Kelce also made an appearance at her younger son's charity event in Kansas City