"La La La"

My sister is getting married next week and I want to surprise her with a song about her and her soon-to-be husband. I designed their wedding programs so I have some good information on them so we can keep it a surprise. Their first date was on November 8 when they went out to eat and she baked him cupcakes and brought one to dinner. For their first Valentines Day, she decided to buy him some Chicago Bulls tickets and they both fell asleep on the train on the way home and ended up at the last stop. Since being together, they developed a love for signing "Teenage Dream" by Katy Perry together, are regulars at Wok n Fire (restaurant) and her OCD can drive him crazy. In the end, they are a perfect pair that are made for each other and I want a song that will help them remember their wedding day for years to come.