Apparently, the alien - who she described as a 'man' - had 'dead eyes' and communicated telepathically with her mum, whose name is Joan.
Ordinary, people wouldn't necessarily notice that someone could communicate telepathically, but Collins did also add that her mum is a witch, which means she would be able to pick this sort of thing up.
"I believe in aliens - my mum has actually met one on the train," Collins said.
"She said, 'I was sitting on the train and I saw this guy - and I thought something's weird about him'.
"Her sixth sense, being a witch, it didn't feel right, so my mum started to feel really uncomfortable."
It was then that her mum managed to make a telepathic connection to this supposed extraterrestrial.
"The eyes were dead. So literally she said, in her head, 'Rustle your newspaper up and down, go up and down with your newspaper three times if you're an alien'" Collins said.
"He done it. My mum reckons this guy was reading her mind. The alien literally formed as a human. But she's never gotten over that story."
The former reality star went on to say that she wasn't scared of aliens, but then why would you be if all they did was shake newspapers up and down a few times? Not exactly destroying the human race, is it?
"Aliens are not to be scared of" she said, "And when I was younger I always used to draw aliens. How crazy is that?"
Collins also invited any aliens who might be happening to listen to her podcast to go round to her house for Christmas dinner.
She said: "I do believe they are real. I'd love to meet them. If there are any aliens looking for somewhere to come for Christmas, come to me."
It's not the first time that Collins has made reference to supernatural beings on her podcast, having once told her listeners that she believes 'lizard people' are live among us.
She said: "My theory is - and this is a little bit weird - I believe there are lizards living amongst us."
She went on to generously say: "If you are a lizard, get in touch with me.
"There have been so many reports that there are different kinds of species living in the UK and around the world - I want to meet you, I want to touch you, I want to smell you, I want to know more."
It's unclear whether any of them actually have reached out to Collins or not, but we highly doubt there will be aliens sitting at the dinner table this Christmas day!
Featured Image Credit: Instagram/@gemmacollins