Rachel McAdams and Dylan O’Brien are stepping out for the world premiere of their new horror-thriller film!

The co-stars posed for photos together on the red carpet at the premiere of Send Help on Wednesday (January 21) held at TCL Chinese Theatre IMAX in Hollywood, Calif.

Fellow cast members in attendance included Edyll Ismail, Emma Raimi, Chris Pang along with director Sam Raimi and producer Zainab Azizi.

The day before, Rachel was presented with a star on the Hollywood Walk of Fame!

Keep reading to find out more…Here’s the official synopsis for Send Help: “Linda Liddle (McAdams) and Bradley Preston (O’Brien) are two colleagues who find themselves stranded on a deserted island after they are the only survivors of a plane crash. They must overcome past grievances and work together to survive, but ultimately, it is an unsettling and darkly humorous battle of wills and wits to make it out alive.”

Send Help hits theaters on January 30. Watch the trailer here!

FYI: Rachel is wearing a vintage Pierre Cardin dress and Tiffany & Co. jewelry.

Click through the gallery for 25+ pictures of the stars at the premiere…