Jason Kelce’s shirtless moment at the recent Kansas City Chiefs-Buffalo Bills playoff game might have caught viewers off-guard, but his mother says she wasn’t surprised.

In an interview with People, Donna Kelce was asked if she was as shocked as the internet at seeing her eldest topless in below-freezing weather during the Jan. 21 playoff game.

“No, not at all. No,” Donna told the outlet of seeing the Philadelphia Eagles center take off his shirt in celebration of his brother Travis Kelce’s touchdown during the game. This, Donna Kelce explained, is because Jason Kelce has “done it on occasion.”

According to Donna Kelce, she’s seen her son display similarly hearty reactions on various occasions, but “he just saves it for special moments.”

Still, Donna Kelce says she understands why his enthusiastic reaction might have been so headline-grabbing.

“A lot of people don’t see it because he’s all business nine times out of 10 when he is on the field,” she said. “He’s so focused on the game, and he’s so into it that people don’t see that side of him.”

According to Donna Kelce, in the aftermath of Jason Kelce’s team losing in the playoffs, he’s been able to “finally let his hair down.”

“It’s a long season that you have to behave yourself,” she explained.