The blonde songstress and her man were spotted on the Brits red carpet earlier in the evening and both were dressed to impress, with Calvin opting for an all-black suit and Rita standing out in a gorgeous bright yellow gown.
Following the ceremony, which was held at London's O2 Arena, Rita then switched up her look and donned something a bit more suitable for dancing in, as she headed to a record label after party.
She was pictured at a bash thrown by her label Roc Nation wearing a feathered little black number and a pair of knee-high, strappy heels.
Protecting herself from the chilly weather, the 22-year-old singer also threw on a cosy coat and transformed her look with a slick of her signature red lipstick, while Calvin stuck with his previous smart ensemble.
But all of that partying must have taken its toll on the Rita's feet, since she was eventually caught heading home in a pair of trainers.
Seen arriving at her London house later on, the pop star had changed into some neon Adidas footwear and also threw on one of her trademark beanie hats, as well as swapping her feathered dress for a pair of jeans.
After her long night at the award ceremony and party-hopping with the likes of Ellie Goulding and Lily Allen too, we don't blame Rita for wanting to stick her comfy gear back on!
However, her beau Calvin didn't seem to mind being dressed up all evening and even though his lady decided to switch her style three times, he remained in his black suit until the early hours.
Rita wasn't the only songstress to change her footwear once the Brits were over, as Beyoncé also donned her trainers after she'd finishing performing at the O2.
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All the Brits red carpet outfits below!
Copyright: WENN Lia Toby