The 34-year-old actress rocked a white Dior mini dress with a lace embellished collar, which she styled with black kitten heels. Mara kept things simple with a classic updo, brown smoky eyes and nude lips. Meanwhile, Bell, 31, opted for a sophisticated black suit and a white button-up shirt.
"Thank you @diorhomme for the fantastic show and for letting me be arm candy ? to this hot guy," the 34-year-old actress wrote on Instagram alongside a snapshot of the two.
Before they arrived to the show, the British actor took to social media to share a snapshot of his gorgeous fiancée and captioned the pic, "Slay."
Mara and Bell got engaged in January of this year. The two met on the set of the 2004 film Fantastic Four and began dating after a year after.
Earlier this month, the House of Cards actress revealed that she doesn’t "love planning" a wedding, whereas "Jamie is very interested."
"I will say, 'I don't care', and he will immediately give a response of exactly the color and the shape — well the shape is obvious," she told Jimmy Fallon during an appearance on The Tonight Show, before jokingly referring to Bell as "the bride."