Singer Miley Cyrus knocks on doors at George Mason University in Virginia to rally support for Democratic presidential nominee Hillary Clinton. (Photo: Jahi Chikwendiu/Video: Reuters)

Singer Miley Cyrus knocks on doors at George Mason University in Virginia to rally support for Democratic presidential nominee Hillary Clinton. (Photo: Jahi Chikwendiu/Video: Reuters)

Miley Cyrus — the celebrity wrecking ball, twerking machine, chart topper, Instagrammer and former Bernie Sanders supporter — added a move to her repertoire Saturday: door-knocker for Hillary Clinton.

“Hello? How are you? I’m Miley,” Cyrus said after knocking on the George Mason University dormitory room door of Jake Zartman, 18, a freshman from Ohio. The 23-year-old pop star, now a coach on NBC’s singing competition “The Voice,” was dressed in a glittery red and silver dress with a blue furry jacket, a blue bow tie covering her chest and a pink headband. The young man was practically quaking.

“I’m here supporting Hillary. Are you going to vote?” Cyrus asked.

“You’ll be proud to know I’ve already voted for Hillary,” Zartman told her.

“Yeah!” she yelped.

A crowd of excited George Mason University students waves to Miley Cyrus, who appeared at a dorm window as she campaigned for Hillary Clinton inside. (Jahi Chikwendiu/The Washington Post)

“Obviously,” Zartman said.

And so it went Saturday afternoon at GMU in the swing state of Virginia, where a lucky number of students in the Piedmont Hall dorm stayed in their pizza-box-laden rooms waiting for Cyrus to enter and chat them up, even pose for selfies on their junky twin beds. They were smiling and sticking their tongues out in trademark Cyrus style.

Hundreds of GMU students not lucky enough to live in Piedmont had to wait outside, where they chanted: “We want Miley! We want Miley!” and sang her songs.

She eventually blew them kisses from a dorm window, hoisting a “Stronger Together” Clinton campaign sign and prompting shouts below of: “Twerk for us! Twerk!”

With less than three weeks until Election Day, the Clinton campaign has deployed Cyrus, Katy Perry and other celebrities in an attempt to boost turnout for the Democratic ticket.

Cyrus’s endorsement of Clinton comes after some very public embraces of Sanders, the senator from Vermont who was Clinton’s top rival in the Democratic primaries. Just last month, Cyrus told Elle magazine that she was going to give “Voice” contestants the following advice: “Be Bernie Sanders. Be the person people want and love. Don’t worry about the masses. That’s how you make a memorable moment. Let people talk about it.”

And six months ago, she participated in a celebrity video pushing Sanders as the Democratic nominee over Clinton. In the April video, in which she appears alongside the likes of Susan Sarandon and Harry Belafonte, she said that Sanders “has been a bad ass in supporting the LGBT community.” She advertised the clip on her Twitter account, saying, “I feel the bern @Bernie Sanders and ­@SusanSarandon.”

Miley Cyrus makes her way down a dorm hallway at George Mason University. (Jahi Chikwendiu/The Washington Post)

Regardless of whether she has been riding the Clinton train the whole time, one thing is clear: The musician is not a fan of Donald Trump. In early 2016, she launched into an Instagram tirade against the eventual Republican nominee, blasting him as a “f---ing nightmare” and vowing to leave the country if he won the White House.

[Donald Trump first swept into the nation’s capital 40 years ago. I didn’t go well.]

Although the sight of the provocateur knocking on doors for Clinton might seem more like a stunt, Cyrus, the daughter of country star Billy Ray Cyrus, has politics in her blood. Her paternal grandfather was Ronald Ray Cyrus, a Democratic member of the Kentucky House of Representatives, who was elected to 11 straight terms from the 1970s through the 1990s.

She has also donated to multiple charities and participated in events to raise money for AIDS patients, natural disasters in Haiti and Japan, and organizations such as Habitat for Humanity.

Cyrus also has history with Clinton, too. In 2013, she impersonated her on “Saturday Night Live.” In the skit, Cyrus as Clinton walks into the Oval Office clad in a pantsuit and says: “What up, y’all? I’m like Hillary Clinton and I wanna be president one day to help, like, gay people, and black people and, like, Asians and little people . . . ” This being Cyrus, she, of course, then flashed open her blazer to show only a bra covering her breasts that had written in large font “2016.”

At GMU, one group of women welcomed Cyrus into a room decorated with a sign that read, “BABE CAVE.”

Katherine Quigley, 19, a sophomore, was among those eager to meet Cyrus. She waited by the peephole of her room’s door, nervously eyeballing the hall to see whether Cyrus would visit.

“I’ve loved her since I was — what? — 12 years old,” Quigley said. “She’s a role model. Oh, God, I peeked my head out. I shouldn’t have. People have been texting me all day about her coming, but I’ve been saying, ‘I can’t confirm anything.’ I have my shoes out, and random clothes. And there’s a random rope in our room. My roommate’s into camping, you know? And there’s a pizza box!”

Suddenly, several knocks.

“Holy moly! Miley Cyrus!”

“How are you!” Cyrus asked. “How are you? I am so happy be here.”

The two fell into a conversation as if they were old friends. Cyrus said she felt like she lived in a bubble in Los Angeles, where she thinks most people are pro-Clinton and support women’s rights and liberal values, whereas when she visits home in Nashville, she feels the opposite.

“What’s, like, your message to Mason students?” Quigley asked.

“Um . . . vote, you know. Vote for Hillary,” she said. “I think honestly, I didn’t know how everyone was going to be today . . . It seems like everyone here is super awesome.”

“That’s such a Miley thing to say!” Quigley said, as she and her new friend laughed.

“This is my first presidential election,” Quigley said.

“Are you voting here?”

“I am voting here.”

Cyrus approved and said if she weren’t filming “The Voice” on Election Day, she might come back to Virginia to personally check.