The "Graveyard" singer posted her first social media snap with the former "American Horror Story" actor in their couple's costume for Halsey's Halloween party on Friday.
Posing with their arms around each other, Halsey channeled Marilyn Manson and Peters dressed up as a member of the Insane Clown Posse.
"resident goths," Halsey captioned the snap.
The new couple was also seen holding hands while the party later in the night.
Halsey's Halloween celebration rivaled the annual Casamigos party which had A-listers like Cindy Crawford, Paris Hilton and Justin Timberlake there.
The singer wore a latex white long-sleeved shirt with jet red wig.
Halsey painted her face white and covered her eyes in blue eyeshadow and colored contacts.
This is the first photo she and Evan Peters have taken together and shared with fans.
The couple has been rumored to be dating since they were spotted getting cozy at Six Flags last month.
Up until that point, fans still thought she was dating Yungblud.
It appears she's now confirmed she's moved onto the actor.
The week after Halsey was first seen with Evan, she jetted off to Greece to ring in her 25th birthday.
Showing off her curves and luxurious lifestyle, Halsey posed during her birthday trip in barely-there clothes while her closest girlfriends snapped away.
The singer and Yungblud confirmed their relationship in January. She wished him happy birthday in August, but it's been months since the two have been spotted together.
Prior to Yungblud, she was dating on-again, off-again boyfriend G-Eazy. Their breakup was riddled with cheating allegations.
Halsey's even been linked to John Mayer in the past.
As for Evan, he was engaged to his "AHS" co-star Emma Roberts. The two called it quits in March.