Jamie and Dakota posed side by side at the highly-anticipated event, held in London's Leicester Square, much to the delight of hundreds of screaming fans.
Despite the chilly temperatures, Dakota - who plays student Anastasia Steele in the movie - didn't shy away from flashing the flesh and chose to wear a floor-length, cream dress with plunging neckline.
The actress' Saint Laurent gown was embellished with a silvery grey trim and she wore her hair naturally straight. Dakota finished her look with a lip-smacking, dark berry pout.
Jamie, meanwhile, looked as handsome as ever as he walked the red carpet in a smart grey suit and tie.
The Northern Irish star was also pictured alongside his wife Amelia Warner, who was clearly proud as punch of her very own Mr Christian Grey!
Last night's UK premiere in London came after the Berlin premiere on Wednesday evening. For that event, Dakota dazzled in a black dress and Jamie opted for black tie.
Fans had camped out overnight in Leicester Square just to get a glimpse of the film's main stars and they will get to watch the movie for the first time today, it is released in cinemas nationwide.
Meanwhile, Fifty Shades Of Grey director Sam Taylor-Wood confirmed this week that two sequels to the film will be made.
Fifty Shades Of Grey is the screen adaptation of the hugely success erotic novel by British writer E. L. James.
Will you be going to watch the movie? Tell us below, as the best comment from across the website each week wins £50.