The Royals first baseman rescued a girl from being trampled after she was knocked down outside the Sprint Center following a Bieber concert Wednesday night.
When Hosmer was spotted leaving the concert with several teammates, he was mobbed by mostly teenage girls, with one getting knocked to the ground.
Hosmer said Friday before the Royals played the Minnesota Twins that he simply did what anybody would do.
"I just saw a girl fall in front of me, and I helped her up," he said. "It wasn't anything heroic or anything like that.
"I think that happened before we all realized what was going [on]. Just helped her up real quick, just doing what a guy should do. You see someone fall, you should help her up."
Hosmer, 26, was drafted third overall by the Royals in 2008 and made his major league debut on May 6, 2011. He is still adapting to his celebrity status, even after making a daring dash for home plate in Game 5 of the World Series to tie the score in the ninth as the Royals rallied to beat the New York Mets in 12 innings.
Hosmer said he was surprised by the attention he received after Wednesday's concert, but he acknowledged, "I guess that's what happens when you win a world championship -- you become more popular."
Information from The Associated Press was used in this report.