Among the featured cast mates in the photos are Tyler Posey, Dylan O'Brien, and Tyler Hoechlin.
'Already feels like home,' Haynes tweeted alongside the announcement.
'They knew the whole time...It was like a Tab Hunter situation,' he said.
Congratulations are in order for the happy couple.
Colton Haynes confirmed his relationship with a romantic selfie taken in bed.
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'Ladies, remember to set your clocks back 100 years tonight,' actress Jessica Chastain wrote.
"I'm a vampire. A shell. Wishing I was the old Colton."
Gomez spoke candidly about recovering from brokenness while accepting an award at the show.
From Kylie Jenner to Beyonce and beyond, which celebrity had the best 2016 Halloween costume?