Big Brother has warned houseguests and viewers to "expect the unexpected" every season -- and over the years, that has usually come to include at least one Big Brother showmance couple on each season of the long-running CBS reality competition.

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Big Brother launched on CBS in 2000 and numerous showmance couples have developed in the 21 years the show has been on the air.

While some showmances on Big Brother seemingly came to fruition due to boredom or a desire for attention and affection, many of Big Brother couples actually went on to solidify genuine, long-lasting relationships outside of the house.

In fact, several Big Brother couples are engaged or married today -- and some of them even have children, including Season 19 couple Jessica Graf and Cody Nickson, Season 12 couple Rachel Reilly and Brendon Villegas, and Season 11 couple Jeff Schroeder and Jordan Lloyd!

Viewers have seen been many Big Brother showmances to come and go on Big Brother, so let's take a trip down memory lane and look at some of the most memorable couples. Which Big Brother showmances worked out and which ones fell apart in the real world?

Did Paulie Calafiore and Zakiyah Everette end up being more than just a hookup? And what ever happened to other pairs like  Jessica Hughbanks and Eric Stein?

Love them or hate them, Reality TV World will also update you on what's going on with more recent couples like Raven Walton and Matthew Clines, Elena Davies and Mark Jansen, Haleigh Broucher and Faysal "Fessy" Shafaat, Tyler Crispen and Angela Rummans, and Jackson Michie and Holly Allen.

And there's also a lot more where those came from, including Austin Matelson and Liz Nolan, Shelli Poole and Clay Honeycutt, and many more!

Click the BEGIN GALLERY link below to see some of the most memorable showmances in Big Brother history and find out whether they are still together or split up!!

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About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.