Question: how many famous people can you fit into a trailer for a rom-com sequel to “Valentine’s Day”?

Answer: 18. Specifically: Halle Berry, Jessica Biel, Seth Meyers, Ludacris, Hilary Swank, Sarah Jessica Parker, Ashton Kutcher, Lea Michele, Michelle Pfeiffer, Zac Efron, Josh Duhamel, Katherine Heigl, Jon Bon Jovi, Hector Elizondo, Sofia Vergara, Abigail Breslin, Til Schweiger and Robert De Niro.

Oh, wait. Make that 20. Ryan Seacrest and Yeardley Smith (voice of Lisa Simpson) also briefly pop up in this trailer for “New Year’s Eve,” too. Watch below and double check the accuracy of my celebrity count. Aso, feel free to tally up the number of rom-com cliches, too. It’s all in the name of movie trailer science, people.