Mr Anniversary Gift

Whether we're talking about Vegas mistakes (à la Britney Spears or Nicky Hilton) or ephemeral unions we're still trying to make sense of (Renée Zellweger and Kenny Chesney, anyone?), celebrities seem more eager than the rest of us to rush down the aisle.

On the other hand, drive-through wedding chapels wouldn't exist if plenty of regular folks weren't also running to the altar on the double.

And while some insta-marriages do work out (like Téa Leoni and David Duchovny, who wed after just four months of dating -- and are still going strong nearly 10 years later), they can also fall apart as quickly -- and dramatically -- as they came together.

"In the early phase of a romance, the dopamine activity in the brain goes up, making you feel high," says REDBOOK Love Network expert Ian Kerner, Ph.D., author of She Comes First and He Comes Next. "But relationships are eventually about how you are at your calmest."

Translation: Wait until the first flush wears off a little before tying the knot. In fact, studies have shown that the closer a couple's courtship is to average length (two years, four months), the more likely they are to last.