The Daily Star is reporting that Jonathan Jones spotted the "so-called beast" in London.
"I've never seen anything like it. Me and my friend came down to London to see the sights, but we never expected this," he said.
He spotted the thing when:
"We were sitting there for about five minutes when the dark shadow emerged. It looked like a shark at first, but it was much bigger and it definitely wasn't reeds like my friends keep saying. Who knows what it was. I'm hoping it was Nessie though - if not some other kind of lost sea creature."
It almost looks like there is something in the water, but who knows. It could just be a shadow or something, or it could be a fake.