Marvin Humes, JB Gill, Oritsé Williams and Aston Merrygold arrived at the Grosvenor House Hotel Ballroom to support BBC Children In Need on Monday night (11 November).
The boys, who were accompanied by their partners, posed for a big group photo once inside.
Capital FM DJ Marvin, who arrived with wife Rochelle Humes, looked smart in a tailored black suit and tie. Rochelle, who is one fifth of girl band The Saturdays, looked stunning in a floor-length Dolce and Gabbana dress.
Meanwhile, Oritsé and girlfriend AJ Azari, who won the first series of ITV dance competition Stepping Out in September, looked like a power couple as they showed off their flair for fashion.
AJ looked gorgeous in a black playsuit with mesh detail, while Oritsé wore a crisp white shirt and jeans.
JB, who celebrates his five-year anniversary with girlfriend Chloe Tangney today, wore a black suit with a bow tie. He looked loved up as he stood next to his dancer girlfriend, who wore a chic black knee-length dress.
Aston, who was accompanied by his dancer girlfriend Sarah Richards, stood out in a smart blue suit jacket and a black polo neck top. Meanwhile, Sarah oozed sophistication in a grey printed maxi dress. Captioning the photo, Aston simply said: "Family."
AJ added on Twitter: "Been a long time since all eight of us have been together."
JLS, who will split at the end of this year after six years together, later took to the stage for a performance.
The event, organised by Take That frontman and X Factor judge Gary Barlow, also saw performances from Jason Donovan, Ellie Goulding, Nicole Scherzinger and current X Factor contestants Rough Copy, who are mentored by Gary.
Later, Marvin even took to the decks for a DJ set. Posting a photo to Twitter, film producer Ben Winston said: "Great night at the Children In Need gala. @GaryBarlow rocked out as ever. And then this man took over @MarvinHumes."
Marvin replied: "@benwinston @GaryBarlow great to see you as always Mensch! Was a great night indeed! @BBCCiN raised a lot of money tonight!! Congrats Mr GB!"
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