The former TOWIE star shared an adorable picture of her holding baby Arthur.
But her followers were shocked to discover that the picture was actually of Billie as a baby being held by mum Suzie.
“This is me and my mumma,” she wrote. “I love this photo so much, I think it looks like me and Arthur.”
Fans shared their disbelief at the likeness with one writing: “I thought it was.”
Another added: “Omg I thought it was you,” while another said: “You look so much like your mum, I thought it was you.”
A fourth fan chimed in: “Literally twins!”
Billie Faiers is left a “very proud mummy” as she celebrates daughter Nelly learning to swim [Instagram]
Billie recently revealed that she’s started to plan her hen-do as her wedding date approaches.
The mum of two has been engaged to Greg Shepherd since 2014, but has so far put her big day on hold to have children Nelly and Arthur.
The 27 year old recently said that she would like to get hitched abroad.
But her warm destination hasn’t changed her plans to go for full-on glamour.
“I want to look glamorous and bridal, but I can’t see myself walking down the beach barefoot,” she told star magazine. “I’d need some kind of flooring so I could wear heels.
“I loved Abbey Clancy’s wedding dress. I don’t want a meringue!”