Fran Vincent, a 54 year old woman from Devon, England, cracked open an egg to make a cake and found .... another egg inside of it!
Fran, a factory worker from Seaton, Devon, said: "I thought it looked a bit big - I thought it might have been a duck egg at first.
"I cracked it open and out came the white and yolk but inside was another egg in its shell. I have never seen anything like it before - they're almost like twins."
David Lanning from a poultry farm explained how it could happen:
"As it was being formed it passed down through the hen's oviduct - the passage from the ovaries to the outside of the body - where the shell is made.
"In young hens, ovulating can be quite irregular. The hen has obviously ovulated quickly twice. The second egg has caught up with the first and the shell has formed around the two of them.
"It's more common with young hens. It's unusual and doesn't happen that often. But it is extremely rare for it to reach the shop shelf."