Ronan Keating leaves fans doing a double-take after sharing sweet family photo of his lookalike son

Ronan Keating stepped out with his wife Storm and five children as he attended Cancer Research UK's annual Emeralds & Ivy Ball on Saturday night - but it was his son who stole the show.

Taking to Instagram, the 44-year-old Irish singer stunned fans as he shared a photo of his rarely-seen lookalike son Jack.

The former Boyzone star stepped behind the camera to photograph his large brood as they walked the red carpet.

Son Jack, 22, could be seen putting a loving arm around sisters Missy, 20, Ali, 16 and baby Coco, as well as little brother Cooper, four.

Alongside the post, the proud dad gushed over his kids being "his world."

"This is my world right here," the musician wrote. "All my babies celebrating our Emerald & Ivy Ball 21, what an incredible night raising over 890k.

"Now in our 14th year. A proud night for the Keating family raising over 10mil in total. Thank you to everyone that has donated over the years."

While some fans took to the comments section to congratulate the family for their charitable efforts, others were more distracted by Jack.

Fans were taken aback by Ronan's likeness to his rarely-seen eldest child, who looked suave in a smart black suit, white shirt and black bowtie.

"Gosh, your kiddo on the left there could be your clone," one gushed.

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A second added: "Wow, your eldest son is your double. Beautiful picture."

"Jack looks exactly like you, I am a long time Boyzone fan, circa 1996 so I would know," a third said under the sweet family snap.

While someone else wrote: "Your big son looks like you. Very lovely family."

The Emeralds and Ivy Ball is a fundraising gala dinner, hosted by Ronan, which celebrates the partnership between Cancer Research UK and the Marie Keating Foundation.

Ronan and Storm are doting parents to Cooper and Coco, while he shares three eldest children with his ex-wife, Yvonne Connolly.