The long hours. Hot love scenes. Always having to be around one another.
With little time to date outside of work, it's no wonder celebrities fall for one another on set. Before you can blink, it's Lights! Camera! Love! As the sparks fly, the paparazzi are taking photos and the media is running any story they can on the will they/won't they make it angle.
The funny part? None of these couples ever imagined they would end up together and live happily ever after, Hollywood style. They never realized that earning the big paycheck is a cinch and dating your co-star also sometimes comes with the job.
So grab your sweetie and read on about how these Hollywood couples are still going strong.
Up first, we start with a notorious ladies man who settled down ...
Warren Beatty and Annette Bening
He was known for being a ladies' man, she was known for her sweet, clean image. The two met during the filming of "Bugsy" in 1991 and Beatty was "looking for someone to make him good."
The feeling ended up being mutual. Bening has said that "he made me feel good ... he wants to do things well. I think we both knew pretty early on in 'Bugsy' what was going on between us."
Together they have four children: Kathlyn Elizabeth, Benjamin, Isabel Ira Ashley, and Ella Corinne.
The kids really are all right.
Warren on Annette: "She has a great capacity to be happy, which is a great gift to me and an even greater gift to her children."
Annette on Warren: "Warren is an individual thinker. He doesn't follow the crowd, and I really like that about him."
Next, Alias meets Bennifer ...
Ben Affleck and Jennifer Garner
The two originally met in the hit film "Pearl Harbor" in 2001 but started dating shortly after the filming of "Daredevil" in 2003. They seemed perfect for each other, with both Affleck and Garner falling for each other's admiration and respect for one another. After nine months of dating, they took a dare on each other by getting engaged.
The superheroes have three children.
Ben sure likes his Jennifers.
Ben on Jennifer: "I don't think she thinks that she is as drop-dead gorgeous as she is and I think that is what gives her this incredibly appealing quality."
Jennifer on Ben: "He's really a gentleman. And he's not afraid to laugh at himself or you."
Up next, a Fresh Prince finds his princess ...
Will Smith and Jada Pinkett
The smooth charmer of "The Fresh Prince of Bel Air" met the sassy Pinkett in 1995 when she tried out for the role of Will's girlfriend. Although she never got the part, she fell for the funny man and got the role as a happily hitched wife two years later.
They also later starred together in the film "Ali" in 2001 and established the Will and Jada Smith Family Foundation, which focuses on youth educational projects and family welfare for charitable organizations in Baltimore and Philadelphia.
Their two children are also in show business: Actor Jaden Christopher Syre ("The Pursuit of Happyness" and "The Karate Kid" remake), and actress/singer Willow Camille Reign ("Whip My Hair"). Smith also has a son from a previous marriage, Willard Christopher "Trey" Smith.
Will on Jada: "Families are like a business. The key is one person having a vision of what it needs to be and being able to pull everyone together. That's Jada for sure."
Jada on Will: "I will throw my career away before I let it break up our marriage. I made it clear to Will. I'd throw it away completely."
Who is our next couple? One word: Brangelina ...
Brad Pitt and Angelina Jolie
Their characters tried to kill one another in "Mr. and Mrs. Smith" in 2005 and somewhere in between, the actors fell for one another. Although Brad was still married to actress Jennifer Aniston at the time, both Pitt and Jolie have denied any romantic extramarital affairs.
But there's little doubt the roots of Brangelina go back to that movie set.
Together the happy yet tired couple have six children: Maddox Chivan, (adopted from Cambodia, shared with ex-husband Billy Bob Thorton); Zahara Marley, (adopted from Ethiopia); Shiloh Nouvel; Pax Thien, (adopted from Vietnam); and twins Knox Leon and Vivienne Marcheline.
Pitt and Jolie have no intention of getting married anytime soon, both saying that their main focus is the children in their lives. They have also expressed that they want more children.
Brad on Angelina: "She is the love of my life."
Last up, we find out what happens when Danny Zuko settles down ...