One of the criteria that directors use when casting roles is the 'chemistry' between characters -- even for platonic relationships. So it's no surprise that co-stars start flirting, which leads to dating before entering full blown relationships!
But what's really impressive about the guys featured in this list is that they have managed to stay together in an industry that is taxing on your personal life, where many great sacrifices are often made. Many of the couples on this list have gone on to get married and have children, and some are now approaching middle age and have built decades upon decades of a wonderful life together.
1. Jennifer Aniston and Justin Theroux on the set of Wanderlust (2012)
Aniston's romantic life has always been under intense public scrutiny, including the 'Brangelina' scandal that must have been incredibly difficult for the Friends star to deal with publicly.
That's why it's so great to see Jennifer and Justin Theroux seem so happy together ever since they met on the set of David Wain's Wanderlust in 2012, with Aniston playing Linda Gergenblatt and Theroux playing Seth.
The two recently married in complete secret on August 5, 2015 in their Bel Air home, with guests including Courtney Cox (so cute!) and Jimmy Kimmel who officiated the ceremony.
2. Jada Pinkett Smith and Will Smith on the Fresh Prince of Bel-Air (Season 5 auditions)
This couple are a little different in the sense that although they met on set when Jada was auditioning for the role of Will's girlfriend, Lisa, she lost out to Nia Long.
However, in real life, the story pretty much went the opposite way, with Jada becoming (real) Will's girlfriend before the couple married in 1997. They also had two children who you might have heard of, namely Jaden and Willow Smith.
It's amazing to watch a couple go through life together. We wish them the very best!
3. Daniel Radcliffe and Erin Darke on the set of Kill Your Darlings (2013)
Harry Potter has grown up and has nabbed himself a fine young lady, 30-year-old Erin Darke. The pair met on the set of Krokidas's Kill Your Darlings.
The couple are super cute together and recently performed a duet of Eminem's 'Slim Shady' that is totally worth your time.
4. Alexis Bledel and Vincent Kartheiser on the set of Mad Men
The Gilmore Girls star Alexis Bledel started dating her now-husband on the set of Mad Men back in 2012. The couple got married in 2014 and they look like such a good pair together!
5. Sarah Michelle Gellar and Freddie Prinze, Jr. on the set of I Know What You Did Last Summer (1997)
This gorgeous couple must have left a lasting impression on one another as it took them three years after working together on the set of Jim Gillespie's I Know What You Did Last Summer to start dating.
Although these guys' romance took off to a slow start, the couple became closer and tied the knot in April of 2001. Now having been married for 14 years, the couple now in live in LA, California and have two kids together: 6-year-old Charlotte Grace and 3-year-old Rocky James.
Buffy is truly slaying our hearts with her personal life!
6. Ryan Reynolds and Blake Lively on the set of Green Lantern (2011)
This very handsome couple started dating early 2010 for the filming of Green Lantern. Ever since, the couple have gone from one major milestone to the next; buying their first property together, getting married in 2012 and having a baby daughter, James, together who is about to turn 1 year old in December!
7. Channing Tatum and Jenna Dewan on the set of Step Up (2006)
The dancing couple married in Malibu three years after they met on the set of Step Up. The couple welcomed daughter, Everly, to the world in 2013 and it's even been recently reported that Dewan wants more kids.
This seems like a couple that will last!
8. Ryan Gosling and Eva Mendes on the set of The Place Beyond The Pines (2012)
First things first, it has to be said that these two make an aesthetically stunning couple. The pair began dating in September 2011 and have since had a baby girl together, Esmeralda Amada.
We're pretty sure that Esmeralda is going to be a stunner too, judging by her parents!
9. Amber Heard and Johnny Depp on the set of The Rum Diary (2011)
Depp and Heard met on the set of Bruce Robinson's The Rum Diary. The pair married in a civil ceremony in February 2015. The couple are engaged in various philanthropic projects together. Only recently, the pair were in Brazil giving hearing aids to the deaf.
What an inspiring partnership!
10. Angelina Jolie and Brad Pitt on the set of Mr. & Mrs. Smith (2005)
We have saved this pair for last for several reasons. Firstly, because of the clandestine nature of the pair's romance that started on the set of Mr. & Mrs. Smith; secondly, they are one of the world media's most famous super couples.
The pair married in France last year and over the years have grown into a very large family with 6 children; 3 biological and 3 adopted.
We can only imagine how chaotic life in the Pitt-Jolie household is. How do the couple have anytime for their blockbuster superstar careers?
Who's your favorite couple?