Sparks On The Set photos

Katharine Hepburn and Spencer Tracy had a 26-year-long affair, though Tracy, who was married, never divorced his wife. The pair acted in nine films together during that time.

Humphrey Bogart and Lauren Bacall met on the set of 1944's To Have and Have Not. She was 19. He was 45, and on his third marriage. The two eventually married, had two children, and stayed together until Bogart's death in 1957.

Laurence Olivier and Vivian Leigh began an affair while acting in 1937's A Fire Over England. They married in 1940, and divorced 20 years later. Their relationship was famously tumultuous, as Leigh suffered from debilitating depression.

Actress Ingrid Bergman fell in love with Italian director Roberto Rossellini while filming Stromboli in 1950. The two began an affair, divorced their spouses, and married in 1950, resulting in a scandal. Actress Isabella Rossellini is their daughter.

Silent film star Mary Pickford and actor Douglas Fairbanks married in 1920, and divorced in 1936. Their grand Beverly Hills mansion was known as "Pickfair."

Joanne Woodward acted with Paul Newman in 1957's The Long Hot Summer. They married the next year, and stayed together until his death in 2008. Theirs is one of the longest marriages in Hollywood history.

In one of Hollywood's most epic romances, actress Elizabeth Taylor married movie star Richard Burton—twice. The couple acted together in 1963's Cleopatra, but they couldn't make their marriage work. "You can't keep clapping a couple sticks of dynamite together without expecting them to blow up," said Burton.

Meg Ryan was married to actor Dennis Quaid when she met Australian actor Russell Crowe on the set of Proof of Life, in 2000. She and Quaid divorced, but the relationship with Crowe fizzled out quickly.

Scarlett Johansson and Josh Hartnett met on the set of Black Dahlia, in 2006. It didn't last long though; Johansson married actor Ryan Reynolds in 2008.

Tom Cruise met Australian actress Nicole Kidman on the set of Days of Thunder in 1990. They adopted two children, and divorced in 2001.

After splitting from Kidman, Tom Cruise's next romance was with Spanish actress Penelope Cruz. Cruise and Cruz met on the set of 2001's Vanilla Sky, and broke off their relationship in 2004.

Penelope Cruz and Matthew McConaughey started dating while filming Sahara in 2005. The movie was a flop, and they broke up about a year later.

In 2005, Brad Pitt was married to Jennifer Aniston when rumors spread of an affair with Mr. and Mrs. Smith co-star Angelina Jolie. Brangelina's been together ever since, and have three adopted and three biological children together.

Susan Sarandon and Tim Robbins met on the set of Bull Durham in 1988. She's 12 years his senior, and they divorced in 2009.

Jude Law and Sienna Miller began dating on the set of Alfie in 2003. They got engaged, but broke it off after Law admitted a fling with his childrens' nanny. In 2009, Law and Miller gave it another go, but broke up again in 2011.

Courteney Cox married David Arquette in 1999, after acting together in 1996's Scream. They separated in October 2010.

Jennifer Garner and Ben Affleck started dating in 2004, after meeting on the set of Daredevil the previous year. They married in 2005.

Goldie Hawn and Kurt Russell first met on the set of 1968's The One and Only, Genuine, Original Family Band, but the sparks didn't fly until 1983, when they filmed Swing Shift. Hawn and Russell have one child together.

Jennifer Aniston and Vince Vaughn began dating in the summer of 2005, while co-starring as a troubled couple in The Breakup. The relationship lasted a little more than a year.

Rachel McAdams and Ryan Gosling met on the set of tearjerker romance The Notebook in 2004. They dated for three years and were engaged, but McAdams broke it off.

Gosling later got together with Blue Valentine co-star Michelle Williams. The couple shared a home for a short while, but it lasted less than a year.

Michelle Williams and Heath Ledger met on the set of Brokeback Mountain in 2004. They went on to have a daughter in 2005, and broke up in 2007. Ledger died in 2008, of an accidental overdose.

Actress Helena Bonham Carter met director Tim Burton while filming Planet of the Apes in 2001. They have two children, and each maintain their own home, connected by a doorway. Burton cast Bonham Carter in several of his films.

Liam Neeson and Natasha Richardson married in 1994, after meeting on the set of Nell. They had two sons, before Richardson died in a tragic skiing accident in 2009.

When Warren Beatty met Annette Bening on the set of Bugsy in 1991, the famous playboy decided to finally settle down. They were married in 1992, and have four children.

In 1990, Jada Pinkett Smith auditioned for a role on Fresh Prince of Bel Air. She didn't get the part, but she caught Will Smith's eye, and the couple married in 1997.

In a June 2011 interview with Details magazine, Shia LaBeouf admitted he'd had a fling with Megan Fox on the set of Transformers. Fox was in a relationship with actor Brian Austin Green at the time.

After a string of relationships with leading men, Julia Roberts found love with cameraman Danny Moder. The two met on the set of The Mexican in 2000, and married in 2002. They have three children together.

In 2009, the two Taylors met on the set of Valentine's Day. By the end of the year, they'd decided to just be friends.

As a vampire and a human in love in Twilight, Kristen Stewart and Robert Pattinson found love off camera as well. The actors have never publicly addressed their relationship.

Anna Paquin and Stephen Moyer, co-stars of vampire drama True Blood, started dating when they filmed the show's pilot in 2007. In 2010, Paquin and Moyer tied the knot.

Alexander Skarsgard plays a vampire on True Blood, but found love with actress Kate Bosworth while filming Straw Dogs. The couple split in 2011, after two years together.