Helena from the Wedding (2010)

Longtime couple Alex, a lawyer-turned-struggling-playwright, and Alice, an insecure woman, have recently married and invited several of their couple friends to Alex's parents' cabin in the upstate woods for New Year's Eve: Don and Lynn, a poor writer who would rather come up with crazy thus ultimately-doomed business ideas, married to a domineering lawyer who seems oblivious to her drinking problem; Steven and Eve, a lawyer and his expectant wife who have previously admitted to attending marriage counseling; and businessman Nick, who left his wife Melissa for a much-younger model, Lola, but they have now broken up so Nick arrives alone. All of the guests being their open and not-so-open relationship dysfunctions and set them against Alex and Alice's honeymoon bliss. But the existent cracks in Alex and Alice's marriage have the potential to split wide open with the last-minute addition of British model Helena, whom Alex and Alice know only casually as one of Eve's bridesmaids--whom Alex tried to hit on at the wedding while he was already seriously dating Alice.