1. Because they are Blair and Chuck, Chuck and Blair.
2. Because butterflies. Enough said.
3. Because Chuck asked her "Are you sure?"
4. Because one day she will be his wife.
5. Because "I'll stand by you through anything."
6. Because he got inspired by looking into her eyes.
7. Because their outfits match.
8. Because she brings out the best in him and he brings out the naughty in her.
9. Because they have tonight.
10. Because he knows that she is not some delicate little flower.
11. Because their children would be the best dressed.
12. Because she was all he could think about all summer.
13. Because...