Diane Keaton

If you're a romantic-comedy lover with a soft spot for wedding movies, then trust me — you've already seen The Big Wedding. The premise itself probably sounds familiar: when a family comes together for a wedding, hijinks ensue, people don't get along, and secrets are revealed. Even most of the cast members have played similar roles before. Diane Keaton and Robert De Niro play the groom's parents, Katherine Heigl is the bitter sister, and Amanda Seyfried plays the bride. And the unoriginality doesn't stop there! If you're tempted to watch The Big Wedding, then let me advise you that you can get the same fix by watching the movies below. Their accomplishment: they each tackled elements of The Big Wedding first — but better.

1. It's Complicated: In Nancy Meyers's comedy It's Complicated, the romance between the divorced couple played by Meryl Streep and Alec Baldwin feels organic and realistic. That's not the case for Keaton and De Niro's characters in Ellie and Don, the divorced parents of groom Alejandro (Ben Barnes) in The Big Wedding. Oh, it is complicated for them — despite the fact that they haven't been married for over 10 years, sparks still fly between them during the wedding weekend — even though he's already moved on with someone else. When Ellie and Don move closer to a reconnection, it's icky and doesn't make sense for their characters.
2. Wedding Crashers: The Big Wedding is rated R, so there's a healthy dose of raunchy humor, but there's nothing you haven't seen before, especially if you've seen Wedding Crashers. There is even one scene that is straight out of the Owen Wilson and Vince Vaughn classic. For frisky family members and R-rated wedding jokes, just watch Wedding Crashers.

Get the rest of the list after the jump.

There's a good chance the trailer for The Big Wedding will feel very familiar to you, because it features a ton of stars in roles we've seen them play before. Amanda Seyfried as a bride-to-be? Check. Robin Williams as a wedding officiant? Check. Diane Keaton as the mother of the bride? Check. The list goes on, as the huge cast also includes the likes of Robert De Niro, Susan Sarandon, and Katherine Heigl, to name a few. The ensemble is drawn together in the name of Alejandro (Ben Barnes), who wants to invite his birth mother to his wedding to Missy (Seyfried). Ready for the wacky twist? He wants his adoptive parents (Keaton and De Niro) to act like they're still together because his birth mother doesn't believe in divorce.

Though the trailer is filled with clichés (think awkward sexual scenarios, uptempo classic songs, and kids who seem to be more mature than their parents), it's still kind of charming. Maybe it's because the preview reminds me of It's Complicated, which is a movie that I love despite its predictability, or that I just resist the cast. The film hits theaters on Oct. 26, but watch the trailer when you read more

In Darling Companion, Diane Keaton and Kevin Kline play husband and wife Beth and Joseph Winter, who go looking for their dog — and the strength in their relationship — in this heartfelt flick. Beth is far more concerned with her pooch Freeway than her workaholic husband, who is fully aware of where he stands in the pecking order and chooses to simply overlook it. That is, until he does the unthinkable and loses the dog. The film delves into the issues of their relationship as the entire community gets involved in the search for Beth's — you guessed it — darling companion.

The story certainly has a bit of a Marley & Me vibe, but it also has an awesome cast chock-full of talent, like Mad Men star Elisabeth Moss, along with one of our favorite guys these days, Mark Duplass. But supporting cast aside, can you ever really go wrong with some solid Diane Keaton? We think not. To check out this cute trailer, just keep reading.

Hollywood marriages are hard to keep together, even when they're just on screen. Diane Keaton and Robert De Niro will star in indie comedy Gently Down the Stream as a divorced couple who pretend to be married again. When their adopted son gets engaged, they agree to pose as a couple at the wedding to keep up appearances for his biological mother.

Katherine Heigl and Amanda Seyfried have also signed on to appear, though we don't know what roles they'll have yet. But let's be honest: it's all about De Niro and Keaton. The legendary actors were costars in The Godfather: Part II but had no scenes together, and while they were costars in Marvin's Room, they didn't play a couple. So this will be our first shot at seeing them playing a pair — even if they're not exactly a happy one, I'm psyched to see their holy acting union.