The San Francisco 49ers head coach was in attendance as Niners running back Christian McCaffrey married model Olivia Culpo on Saturday.
Shanahan joined a host of 49ers stars including George Kittle and Kyle Juszczyk at the lavish wedding in Watch Hill, Rhode Island.
The 44-year-old rocked a black tuxedo, slicked-back hair, and a pair of sunglasses for the glitzy occasion.
But it was his new facial hair that sent the NFL world into a spin.
Shanahan debuted a new mustache, with his changed appearance even fooling some die-hard Niners fans.
“I didn’t even recognize Kyle!” gasped one fan on X as the snap went viral.
“Kyle Shanahan or Walt Disney?” laughed another.
“Looking like an undercover CIA agent at a party,” commented a third.
“Trying to disguise himself after two Super Bowl losses to the Chiefs,” joked a fourth.
“He wants to be Andy Reid so bad,” added a firth.
Shanahan led the Niners to two Super Bowls, most recently in February.
He has twice been denied a ring by the mustachioed Reid and the Kansas City Chiefs, who are chasing a historic three-peat next season.
McCaffrey proposed to Sports Illustrated model Culpo last July.
The pair had dated for four years, with Culpo celebrating her engagement with a wild bachelorette party in Cabo, Mexico.
McCaffrey was named the NFL’s Offensive Player of the Season in 2023.
He reached his third Pro Bowl after recording 2,023 yards from scrimmage and 21 total touchdowns.
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The dual-threat running back enjoyed a mammoth workload during his first full season with the Niners.
He was on the field for 81% of the 49ers offensive snaps last season, per Fox Sports.
Shanahan is planning to cap McCaffrey’s heavy usage as he looks to protect his most explosive playmaker.
“We have guys that can run the ball,” Shanahan said.
“We have to protect Christian from himself. He doesn’t like to ever come out, no matter what the situation is.
“And I do think that’s something we could protect him with more.”