Metcalfe, 37, proposed to the fashion blogger during a romantic boat ride on the Hudson River in New York in August after ten years of dating.
They finally threw a party to celebrate their engagement with family and friends at the luxury club Hills Penthouse West Hollywood in Los Angeles, reported E! online.
They shared a video on Instagram made up of pictures of the couple, wearing a grey suit and plum shirt and backless gold sequinned dress respectively, posing in a photo booth.
In the various snapshots, they are smiling for the camera, kissing, and holding hands, with their names written in a love heart in the corner of the snaps.
"Such A Fun Night // Thank You To All Our Family And Friends For Celebrating With Us //," Cara wrote, followed by snaps of her hanging out with friends at the club, including Olivia Culpo.
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