Dawson's Creek - Katie Holmes & Joshua Jackson
Would you believe that Katie Holmes once dated people that were age appropriate and seemingly normal, including her one time Dawson's Creek co-star Joshua Jackson? The two dated for the first season and a half of Dawson's Creek; Holmes refers to Jackson as her first love and told Rolling Stone "it was something so incredible and indescribable that I will treasure it always". Interestingly, by the time Pacey and Joey were shacking up on Dawson's in Season 3, the Holmes/Jackson relationship had already come to an end. Luckily, Holmes to date describes Jackson as one of her best friends, so I guess things weren't too uncomfortable.
Brothers & Sisters - Emily VanCamp & Dave Annable
Dave Annable and Emily VanCamp were not originally slated to play lovers on Brothers & Sisters; after all, she was his illegitimate half-sister. However, the chemistry between the two was so undeniable (sidebar - VanCamp seems to be a serial costar dater as she dated her Everwood brother Chris Pratt a few years back) that in a controversial move, the show's producers de-Walker-ed Rebecca so that she was no longer related to Justin and the two could date onscreen. Why such chemistry? They were dating in real life. The two have since broken up and what do you know...Rebecca and Justin are fighting an awful lot these days...!
One Tree Hill - Sophia Bush & Chad Michael Murray
Honestly, Brooke Davis and Lucas Scott might have lasted longer than the real-life marriage of costars Sophia Bush and Chad Michael Murray. The One Tree Hill actors dated from almost the show's beginning for 2 years before getting married in 2005. However, the marriage lasted only a quick 5 months with Bush citing fraud (re: Murray likely cheated). The onscreen romance of the divorced costars continued for a while longer, so I guess it's a testament to everyone's acting that we couldn't tell they likely hated each other at the time.
Alias - Jennifer Garner & Michael Vartan
After Jennifer Garner/Scott Foley (the two were married) and before Bennifer 2 (Garner and now-husband Ben Affleck) there was an onscreen romance turned real between Alias costars Garner and Michael Vartan. The two dated for around a year between 2003 and 2004. Their romance fizzled however before Alias's conclusion and it was even rumored that this contributed to Vartan's reduced role in the show's final season. Either way, I am relieved that Sydney and Vaughan were still able to end up happily ever after on screen, as those two characters were meant to be.
Gossip Girl - Blake Lively & Penn Badgley
Dan and Serena might be on and off onscreen, but in reality, Blake Lively and Penn Badgley are most definitely ON, as pictures of the two nuzzling on set or frolicking on a beach somewhere are frequently splashed around the tabloids. The two have been dating since late 2007 and as far as we can tell are still going strong. So...will they fizzle like the real-life romances of so many other costars we have described? Time will tell.
So...which on/off screen couple has been your favorite?
Have any other examples of relationships that have taken place both on and off screen? Share 'em in comments!