She is the beautiful actress who starred in those memorable Doritos commercials, and he is the "Saved by the Bell" star-turned-talk-show host. And now, just 18 days after getting married in Mexico, Ali Landry and Mario Lopez are no longer together.

So what could have gone so wrong in just a couple of weeks? Us Weekly Senior Editor BJ Sigesmund tells us that friends and family share their theories about what happened. "Supposedly, he got in trouble for an event that allegedly happened at his bachelor party," Sigesmund reveals.

We spoke to Mario's people today, who say there's more to this story, and sources tell us other reports that the couple has annulled their marriage are not true.

We' ve learned that the couple's marriage was videotaped for an "Oprah" special. We have also learned that Ali and Mario want to work this out in private.

Meanwhile, Kiefer Sutherland is ending his 8-year marriage, and "Extra" has obtained the revealing divorce papers. The star of the hit TV show "24" filed for divorce from his wife, Elizabeth, citing: "Irreconcilable differences."

In the papers, Sutherland lists his assets, which include two homes, three cars, horses and a guitar collection worth $173,000. His total assets amount to more than $5.6 million.

Sutherland also lists his monthly expenses, which include: $2,500 for eating out, $1,668 for laundry and cleaning and $6,843 for entertainment, gifts and vacations. The total monthly expenses came to more than $33,000.

Kiefer and Elizabeth have been separated since1999 and have no children.