If you love bridal shows and haven't checked out 'Say Yes to the Dress' yet, now is a perfect opportunity. The reality series returns Friday, April 30, 9PM ET on TLC, and it's all about the inner workings of Kleinfeld Bridal, a premiere bridal salon whose goal is to make every bride completely happy with her wardrobe for the big day.

In honor of the show's return, I've compiled a few TV weddings that didn't happen for various reasons. Maybe if the brides had gone to Kleinfeld Bridal, things would have turned out differently ... or not.

For top TV weddings that actually did happen, check out Memorable TV Weddings. Jim and Pam, Niles and Daphne, and Luke and Laura made the list.

1. Xander and Anya, 'Buffy the Vampire Slayer.' I know Xander wasn't ready to take the leap, but it still saddens me to think he left ex-vengeance demon Anya on their wedding day, thanks to a nudge by a demon pretending to be Xander's future self (it wasn't pretty). Then there was that awful business with Anya and Spike hooking up, Xander attacking Spike, and the Scooby gang discovering that Buffy and Spike had been sleeping together for a while. What a mess!

2. Diane and Sam, 'Cheers.' Did anyone think these two would go through with their marriage? This relationship had so many ups and downs, Six Flags could have made a roller coaster ride out of it. Let's see ... there were several proposals, a near murder, and a courtroom scene that culminated in her saying yes. But alas, Diane left Sam at the (bar) altar when a book deal came calling. He told her to go write the book and come back in six months. She did come back, but not until six years later.

3. Luke and Lorelai, 'Gilmore Girls.' So close, and yet so far away. When Luke learned he had a daughter, he got cold feet on his upcoming nuptials with lovely Lorelai. In turn, she became impatient waiting for him to move their relationship forward, so she gave him an ultimatum. He wanted time to think, and before you know it, the wedding was off. But all wasn't lost; in the series finale, the two got back together. Whether they married or not is anyone's guess.

4. Derek and Meredith, 'Grey's Anatomy.' Let's face it. We all knew Meredith would never don a frou-frou wedding dress -- even one Izzie picked out for her -- and walk down the aisle with Derek. It's just not her. The couple finally decided to get married at City Hall, but their hectic schedules prevented it from happening. In the end, they did get "married" -- sort of -- by signing a marriage contract on a pad of Post-it notes. Their vows included: "You'll love me, even when you hate me" and "You'll love me, even when we're old and smelly." Derek also vowed to remind Meredith who he was if she ever got Alzheimer's like her mother.

5. Justin and Rebecca, 'Brothers and Sisters.' Things never looked particularly good for this couple, partly because of Justin's shortcomings at school and overall fears about being a good husband and father. After talking with Rebecca, he regained his confidence and the picture-perfect beachfront wedding was a go. Then there was that awful moment when Kitty collapsed while reading an e.e. cummings poem. Justin and Rebecca eventually did tie the knot, but their future is sure to be anything but smooth sailing.

Who'd I miss? Feel free to add your own favorite non-weddings in the comments below.

(Follow @jboursaw on Twitter.)