Brad Pitt & Angelina Jolie The couple are still together, allthough they won't marry before there are equal marital rights for both straight and gay. Mc Queen and Candice Accola (though I think they've also broken up already) Chris Zylka and Phoebe Tonkin (they met on the set of The Secret Circle, but I think they only recently started going out) It's rumored Shay Mitchell and Keegan Allen have dated as well.They have six children together, Maddox, Zahara and Pax who's adopted, Shiloh and the twins Vivienne and Knox. Ashley Benson and Tyler Blackburn (also met on set but started dating later on).Pretty sure Evan Rachel Wood and Alexander Skarsgard met during it as well (though it's more rumored like they had a fling).
Then her and Dave Annable met on set of Brothers and Sisters and now she's dating another fellow co-star, Joshua Bowman. She moved on to dating Jamie Campbell Bower, they star together in The Mortal Instruments - City of Bones.
Ginnifer Goodwin and Josh Dallas met on Once Upon a Time. Prior to that, Jennifer Morrison dated Jesse Spencer, whom she met while shooting House. From the Narnia Chronicles, Anna Popplewell has dated her onscreen brother, William Moseley and is also rumored to have dated other brother, Skandar Keynes.
Josie Loren seems to be dating "Make it or Break it" co-star, Zane Holtz.
Cassie Scerbo (also from MIOBI) has dated co-stars Cody Longo and Joshua Bowman.
From Skins: Nicholas Hoult is rumored to have dated his sister on the show, Kaya Scodelario.