Simpson wrapped his arms around the star.
Of course, the two celebrities listened to some of Idol's songs during the evening.
A lot of work went into making these costumes.
"My Idol," Cyrus captioned the snapshot.
It looks like their jackets say it all.
The dynamic duo channeled Idol and Lister for this year's look.
This pair went all out for Halloween 2019.
Cyrus couldn't resist giving her main man a smooch while helping him with his costume.
It looks like their feelings for one another can't be tamed.
What can we say? She's just being Miley.
It looks like these two had a great time!
The musician held his leading lady close in this sexy snap.