Hayden Christensen and Natalie Portman in 'Star Wars'(01 of12)
Open Image ModalAdmittedly it can't be easy to make outer space sexy... but this pair could really have tried a little bit harder, at least. (credit:WENN)
Christian Bale and Katie Holmes in 'Batman Begins'(02 of12)
Open Image ModalMysteriously, Katie Holmes decided not to return for 'The Dark Knight'. How curious. (credit:Warner Bro/Everett/REX)
Jamie Dornan And Dakota Johnson in 'Fifty Shades of Grey'(03 of12)
Open Image ModalSo much of 'Fifty Shades' was simply so terrible that it's impossible to know where to point the finger of blame, but the lack of chemistry between supposed lovers Christian Grey and Anastasia Steele really didn't help. (credit:Focus Features/Courtesy Everet/REX)
Tom Cruise and Nicole Kidman in 'Eyes Wide Shut'(04 of12)
Open Image ModalThese two were actually married in real life - so why is it so difficult for us to believe their characters are in love, or even like at each other? (credit:Warner Bro/Everett/REX)
Jennifer Lopez and Ben Affleck in 'Gigli'(05 of12)
Open Image ModalAnother couple you wouldn't think were actually an item in real life, 'Gigli' is constantly being held up as one of the worst films of all time. Bennifer - as they were known then - split up just months after 'Gigli' was released. We're sure there was no link. (credit:c.Columbia/Everett/REX)
Keira Knightley and Orlando Bloom in 'Pirates of the Caribbean'(06 of12)
Open Image ModalGood hair, though. (credit:c.W. Disney/Everett/REX)
Beyoncé and Idris Elba in 'Obsessed'(07 of12)
Open Image ModalTwo of the most fanciable people on the planet starring together in a film should equate to two characters that are like magnets immediately drawn to each other on screen, right?Sadly not. In fact, when asked what it was like to kiss the Queen Bey on film, Idris described it as "weird". Trust us, it shows. (credit:Snap Stills/Rex)
Kate Winslet and Jack Black in 'The Holiday'(08 of12)
Open Image Modal'The Holiday' is such a lovely film when you're actually watching it that we almost can't bear to say anything about this on-screen coupling... but unfortunately in the cruel light of day, they simply don't work well together. Sad, but true. (credit:Moviestore Collection/Rex)
Michelle Pfeiffer and Zac Efron in 'New Year's Eve'(09 of12)
Open Image ModalThis gallery could probably be made up entirely of the couples from 'New Year's Eve', but of those, Michelle and Zac are definitely the least believable. (credit:c.Warner Br/Everett/REX)
Matthew McConaughey and Kate Hudson in 'How To Lose A Guy In 10 Days'(10 of12)
Open Image ModalThis man has an Oscar now. If that's not proof we can all do anything we put our minds to, then what is? (credit:Snap Stills/Rex)
Lindsay Lohan and Garrett Hedlund in 'Georgia Rule'(11 of12)
Open Image ModalLindsay would claim years later that 'Georgia Rule' would be the film performance she was most proud of. Based on her screen "chemistry" with co-star Garrett Hedlund, we'd advise her to seriously reconsider. (credit:c.Universal/Everett/REX)
Nicole Kidman and Will Ferrell in 'Bewitched'(12 of12)
Open Image ModalThis still photo pretty much sums up the acting throughout 'Bewitched', unfortunately. (credit:c.Columbia/Everett/REX)