Katie Holmes and Tom Cruise
Tom Cruise is one of the biggest movie stars in the world, so it's not surprising that when he and the baby-faced Katie Holmes (who's 16 years his junior) announced their engagement after only six weeks of dating, people had their doubts.
But the excitable actor leaped off Oprah's couch and into one of the most talked-about weddings of the decade when he and Holmes exchanged vows in 2006 at the Odescalchi Castle in Bracciano, Italy.
Holmes wore a couture silk wedding gown by Giorgio Armani, and after the double-ring Scientology ceremony, Cruise made his bride swoon by crooning a rendition of "You've Lost That Loving Feeling," a la "Top Gun."
Celebs such as Will Smith, Jennifer Lopez, Jim Carrey and David Beckham attended the nuptials, and they enjoyed a five-tiered white chocolate mousse wedding cake and a state-of-the-art fireworks display.