Celebrity odd couples

It can be easy to forget that one of the unlikeliest celebrity pairings happened when America's sweetheart Julia Roberts hooked up with country crooner Lyle Lovett in 1993. The 27-year-old Roberts fell so hard for the 37-year-old Lovett that the couple were married just three weeks after meeting. The marriage broke up almost as quickly though, lasting less than two years.

In 2008, Cher dished in several interviews, including one with Oprah Winfrey, that she dated Tom Cruise before he was a big star. She told "Entertainment Tonight" that the two dated sometime after "Risky Business" in 1983 but before "The Color of Money" in 1986.

While still just engaged, comedian Tom Green had a head-scratcher of a cameo in Drew Barrymore's "Charlie's Angels." The cameo was only matched by the couple's romance. They would get married in June 2001, only to file for divorce in December 2001.

A source told the British tabloid The Daily Mirror in 2008 that Michael Jackson and "Baywatch" babe Pamela Anderson had gone on a string of dates. "It was all arranged by their people in total secrecy, very cloak and dagger," the source said. Perhaps they bonded over their mutual interest in plastic surgery?

Jackson himself had a tendency to defy expectations when it came to his romances. In 1994, he married Lisa Marie Presley, Elvis' daughter, just 20 days after her divorce from singer-songwriter Danny Keough. The kooky couple, who had first met in the 1970s when the then 7-year-old Presley attended several of his concerts in Las Vegas, left people squirming with their kiss at the 1994 MTV Video Music Awards. Despite their claims of happiness, the relationship fell apart two years later.

You could make an argument for Lisa Marie Presley's rebound marriage to actor Nicolas Cage in 2002, but instead we'll turn our attention to another of Cage's relationships, this one to Brooke Shields in the late 1980s. Although little is known about their relationship, the two dated for about a year.

But while the Cage-Shields relationship seems a bit off, even more strange was the high-profile coupling between long-haired rebellious tennis star Andre Agassi and Shields. The two dated for six years before marrying in 1999, although they divorced just two years later. Of course, the relationship came after Agassi dated Barbra Streisand in the early 1990s, so it might rank as only the second oddest relationship Agassi had.

While the matchup between Angelina Jolie and Billy Bob Thornton seems strange on the surface, it couldn't hold a candle to the couple's strange actions. Married between 2000 and 2003, the Oscar-winners became known for their eccentric displays of affection, which reportedly included wearing vials of each other's blood around their necks. Thornton later clarified that the "vials" were, instead, two small lockets, each containing only a single drop of blood. Which makes it only slightly less creepy.