This is a lesser known classic from the 1930's, starring two of the greats, Cary Grant and Katharine Hepburn. It's often overshadowed by their other famous pairings in Bringing Up Baby (1938) and The Philadelphia Story (1940), but this one is just as good, a classy family get together on New Year's Eve. Cary is engaged to Kate's sister and comes home to meet her folks, but of course the sister is all wrong for him and he falls for Kate instead. Lew Ayres is hilarious as her drunken brother Ned, and Edward Everett Horton is another standout in support (he was kind of like the Paul Giamatti of the 30's). George Cukor was Katharine Hepburn's favorite director, who helmed several of her other classics, including The Philadephia Story, Adam's Rib, and Pat and Mike. Check this one out for New Year's, it's as sparklingly fizzy as a glass of champagne.
No trailer for this one, so here's a scene from the movie: