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.
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."