It Had to Be You (2000)

"Love is what happens when you're busy making other plans."

Sparks fly when Anna Penn and Charlie Hudson meet. Unfortunately, they're both engaged to other people. In fact, they're staying at the same New York City hotel in order to work on wrapping up the last details of their nuptials. Over days and evenings of joint wedding planning, the two grow closer -- and start to wonder if they're getting married to the right people after all.