The pair were seen in full costume and were dressed as Juggalos, fans of the hip-hop group Insane Clown Posse. Halsey and Peter donned ISP t-shirts and painted faces.
Earlier that evening, Halsey dressed up as Marilyn Manson, wearing a figure-hugging white leather bodysuit, matching thigh-high boots and a red wig.
The "Without Me" singer seemingly went Instagram official with the actor as she shared a pic with Peters on her profile.
"resident goths. @marilynmanson," Halsey captioned the post.
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The pair were first linked late last month after photos emerged of them holding hands at Six Flags Magic Mountain outside Los Angeles, as published by DailyMail.com.
And it is well-known that Halsey is a big fan of Peters as she said in a since-deleted tweet in 2013, "Petition for Evan Peters to date me," followed by "I'm so in love with Evan Peters I'm so whipped I'm whipped as f--k!" in 2014.
The photographs from the amusement park jaunt show Halsey and Peters lifting their arms up with their hands locked during a roller coaster ride. The two were smiling and laughing while looking into each other's eyes.
Back in 2012, Halsey first confessed her Twitter "crush" on Peters, who was known for playing unsavory characters in the "AHS" franchise. "Seriously Evan Peters stop making me attracted to alleged sociopaths and accused murderers," the New Jersey native wrote, per DailyMail.com.
During that time, Peters was involved with actress Emma Roberts. The pair ended their on-again/off-again relationship, including an engagement, back in March. Roberts is reportedly dating actor Garrett Hedlund.
Halsey called it quits with her on-again/off-again beau G-Eazy in October of last year. After her relationship with the rapper, Halsey was linked to British entertainer Yungblud, however, the former couple reportedly split earlier this fall.