It’s that time of year again. Children — and even maybe a few older millennials — will appear at your door requesting Twix, Milky Ways, and Reese’s (no apples, please).

Approximately a third of these soliciting rugrats will be dressed as Elsa from “Frozen.” Another third will be various superheroes. The final group will be covered in gauze and tulle to impersonate a ghost or other spook. Let’s just hope they’re friendly.

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But what about the (presumably) actual otherworldly creatures that many believe do go bump in the night? There are enough eyewitnesses in Hollywood alone to “prove” ghosts exist, and Halloween is the perfect time to look at a few A-listers who are firmly convinced they’ve seen these beings personally.

The ghost that once haunted Lady Gaga is perhaps the most specific. His name is Ryan. She was so afraid of him, in fact, that in 2010, while on her Monster Ball tour, she held a séance in Ireland to ward him off. She even spent thousands of dollars on an electromagnetic sweeper that was said to remove evil spirits and “bad energy” from her presence. It reportedly worked — reportedly. But she remains a bit of a spook herself.

Kesha, unlike Gaga, goes so far as to say she has ahem … been super intimate with the paranormal. But that doesn’t mean she’s not afraid.

She told Ryan Seacrest in 2012, “[Having sex with a ghost] did scare me, but that’s part of the fun of it!” Her song “Supernatural” is, apparently, based on personal experience. “I don’t know his name!” she added. “He was a ghost! I’m very open to it.”

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Pop darling Selena Gomez once told Jimmy Fallon that she believes in ghosts. So much so, actually, that she’s said to use a phone app that monitors weird spiritual activity in her area. We wonder how that works. Did it scream at her when she dated Justin Bieber? At least he’s a little less creepy than a specter — maybe.

It’s not only women who meet spirits, though. Ryan Gosling has said his family moved out of his childhood home in Ontario, Canada, because of paranormal activity. He was the first to see a ghost in the house. “He just sat,” Gosling told Nick Swift. “And I knew from a very young age that he was a ghost, too. He scared me. I told my mother, but she couldn’t see him. Nobody could. And I learned to live with that.”

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Matthew McConaughey, too, says he’s been haunted. A “friendly blue mist” that he dubbed Madame Blue, is pretty great, he explained to Elle. “She’s a cool ghost,” he added. “Maybe me being nude all the time is why we get along.” We really hope he can’t compare notes with Kesha.

As if Miley Cyrus weren’t creepy enough, she also told Elle that she’s got spiritual connections. “I thought I had seen a little boy sitting on the sink watching me take a shower so I felt really freaked out. I was sitting there the next night and maybe I’m crazy, but I could have sworn I could see this little boy sitting there on the sink kicking his feet.” Beyond this story, we wonder if she is, in fact, a little crazy.

And finally, because it’s worth remembering during election season, there’s Hillary Clinton, who famously contacted Eleanor Roosevelt to ask the late first lady’s advice. Washington Post reporter Bob Woodward wrote in his 1996 book “The Choice” that Hillary sought Jean Houston, a dabbler in the spiritual and psychic realm, to help her as an adviser.

Because Hillary deeply admired Roosevelt, Houston encouraged her to “talk” to the other first lady. Hillary did, asking Roosevelt questions such as, “How did you put up with this?” and “How did you go on day-to-day, with all the attacks and criticisms that would be hurled your way?”

Most people didn’t know about Hillary’s sessions with Houston. They were kept highly confidential, since Nancy Reagan’s dabbling in astrology had been mocked. When Woodard’s book was published, however, Hillary’s near-séances were exposed.

Bill Clinton mentioned the Roosevelt conversations as late as 2012 while speaking at a ceremony on Roosevelt Island. He said, “[A]s all of you famously learned when I served as president, my wife … was known to commune with Eleanor on a regular basis … And so she called me last night on her way home from Peru to remind me to say that. That Eleanor had talked to her and reminded her that I should say that.”

Hillary has maintained that she and Houston merely used imagination to think about how Roosevelt would have dealt with specific problems.

Well, Hillary, we’ll believe you. Maybe. But if dead people, including Eleanor, vote for you, it wouldn’t surprise us at all.