"Looking forward to our @Thesaturdays Christmas gathering this evening.... Sushi style lol X," wrote Una Foden on Twitter.
"Me tooo," replied Rochelle Humes. "We are so traditional ha."
Two members of the five-piece band seemed particularly happy to be reunited at the dinner.
"Molluna are back!" Tweeted mum-of-one Una with a picture herself and Mollie King.
"I love you Mrs Foden," replied Mollie. "Too too much."
For the Christmas outing Una wore a black fur-lined coat over a navy blue dress which she accessorised with a red belt, lipstick and heels.
Mollie, 26, and Rochelle, 24, both opted for all-black ensembles, while 24-year-old Vanessa sported a dark green skirt and a black jumper embellished with jewels.
New mum Frankie Sandford no doubt enjoyed being back with the band, having spent the past few months caring for her new born son, Parker.
It's been quite a year for the British quintet, who have starred in a reality show, welcomed two mini-Saturdays and had a number one single.