The actress shows off her body in black underwear in the clip – which also features Breaking Bad's Aaron Paul.
Other scenes show Emily, 27, and Aaron, 39, share a passionate smooch in a swimming pool after dark.
The brunette beauty – who plays Cassie in the film – also appears to get caught half-naked by a hidden camera as she gets changed in a bedroom.
Thriller Welcome Home tells the story of a couple who spend the weekend in a rental home in the Italian countryside in a bid to repair their relationship.
However, all is not as it seems and the pair soon become victims of the homeowner's sinister plans.
Emily first shot to fame in 2013 after she appeared nude in the music video for Robin Thicke's controversial hit single Blurred Lines.
The star went on to secure roles in hit films, such as Gone Girl, and just last month she was seen in steamy car sex scenes for new film Cruise.
Emily plays bad girl Jessica Weinberg in the romance drama, which she stars in alongside Spencer Boldam.
The model previously confessed that she is desperate to secure more acting roles as she progresses in her career.
Speaking to Pop Sugar, she said: "I would love for more acting, and the biggest struggle at this moment is finding projects that really speak to me and that I really feel excited about.
"Movies are in a weird place in general right now.
"People don't go to the movies like they used to. Studios are strange. I feel that there is some female narrative, but a lot of them aren't actually true stories about women.
"They're just man stories with a woman in it.
"I think finding the right projects that really get me excited. And I don't mean the big studio movies with this director or that director, but things that are fun.
"It's a group project, basically. I want to find good groups to make stuff with."
Welcome Home is set to be released next month.
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