Villa, a Trump supporter who is reportedly considering a run for Congress, told the AP on Tuesday she reported her complaint to Washington police on Christmas Eve and plans to meet with investigators there next week.
She claims Lewandowski slapped her twice on the buttocks in late November. Villa said she told him to stop after the first time, but he still struck her afterward, according to the news service.
After the first slap, Villa half-jokingly told Lewandowski that she could report him for sexual harassment, to which he responded "go ahead, I work in the private sector," she told Politico in an earlier interview.
The songstress, whose "Make America Great Again" dress attracted attention at this year's Grammy's, tweeted about the incident earlier this week.
CNBC was unable to reach Lewandowski for comment. The AP reported that he did not respond to its request for comment.
Correction: An earlier version misstated when Villa filed the complaint. It was Christmas Eve.