Marvin Humes and wife Rochelle joined Oritsé Williams and his girlfriend AJ Azari, along with JB Gill and his new fiancée Chloe Tangney for dinner in London.
The only member missing from the celebrations was Aston Merrygold, who is currently in Los Angeles working on music, and his girlfriend Sarah Richards.
Mum-of-one Rochelle, who looked chic in a navy blue knee-length dress, took plenty of photos of the night and cuddled up to a dapper-looking Marvin at the table.
The dinner was also a celebration for recently-engaged couple JB and Chloe. 'Billion Lights' singer JB popped the question to long-term girlfriend Chloe last month and announced the happy news on Twitter with a photo of Chloe's hands over his mouth.
With Chloe's sparkling engagement ring in full view, JB announced to fans: "She said yes... #chlobeengaged x."
The couple are now busy preparing for their wedding and, responding to a fan who asked about his imminent plans, JB said: "It's hard work!! Getting there though!" We wonder if JB is planning on having his former bandmates as his best men - just like Marvin did?!
After enjoying dinner, Oritsé tweeted: "What a GREAT night with @AJAzari @RochelleTheSats @marvinhumes @JBGill @ChloeTangney!! @AstonMerrygold& @sarahsugar84 We need to do a part2 X."
And Oritsé, who recently came back from a romantic holiday in Mauritius with AJ, later added: "@ajazari & I really enjoyed seeing the old gang last night! #GoodTimes #3WayDateNight."
JLS parted ways in December after six years together. The group, who rose to fame on The X Factor in 2008, wrapped up their music career with a 'Goodbye' farewell tour and album.
Watch JLS' music video for 'Billion Lights' below: