Miley Cyrus has been working overtime lately to prove to the world that she's all grown up, from her engagement to Liam Hemsworth and seductive "Two and a Half Men" cameo to her chopped-and-dyed hair and ... shooting a video with a porn star?

That was the latest headline Wednesday (October 31) about the onetime Disney princess, but it's not as salacious as it might sound. The music video, for the dubstep track "Decisions" by Borgore, happens to feature Cyrus (who sings on the chorus) and the Israeli DJ's ex-girlfriend, adult-film star Jessie Andrews. Borgore wrote the song about Andrews, who won Best Actress at the AVN Awards this year, so when she popped up on set, of course the track's inspiration had to make a cameo.
"I was actually just coming to support," Andrews told MTV News on Wednesday. "I wasn't supposed to be in the video. They needed more girls, and they were like, 'Be in it! Be in it!' And I was like, 'No,' because the song is about me."

Andrews ended up relenting, but by the time she arrived on set around 2 a.m., Cyrus had already finished filming her scenes. Even if they didn't have screen time together, Andrews said she totally gets what Miley is going for with the wild new video, which premieres Thursday.

"I understand where she's coming from, trying to break away from that," she said of Cyrus' child-star past. "She doesn't want to be Hannah Montana anymore; she wants to be her own person. ... The way she's dressing, the hair, the music — everything is outside of the box. It didn't really surprise me."

Cyrus told Rolling Stone last month that the "Decisions" video shoot was quite the scene. "That sh-- was crazy!" she said. "[Borgore] walked into his hotel room, and it was people in the weirdest clothes you've ever seen. My fiance was dressed as a unicorn. We make out in the video, which is very funny. It's just the most random group. We walk in and we're like, 'This feels like a party,' so it's dope."

So what other craziness did Andrews witness on set? "There was a goat, there was a dog, there was a lot of little people, like six midgets," Andrews told us. "There was a huge Amazon lady and a lady with huge, huge boobs. Just a lot of crazy things and half-naked girls and cakes."

Borgore didn't know Cyrus before she recorded vocals for "Decisions," Andrews said, and he was just as surprised as Miley's fans were when she ended up on the dance track.

"He wrote the song just as a single for him, and he didn't know Miley was going to be on it until after the fact," she revealed. "They wanted to put a girl vocal on it, but they didn't know who. Both of them are with the same management, so they decided that she would be good for it. And they pitched it to her and she liked it, so she got on the track.

"It was really random, because he had put out the single and everything, and nobody could really tell who it was," she added. "And then one day, [ Miley ] randomly tweeted it. And he was like, 'I don't know if this is good or bad.' I was like, 'I mean, it's good. There's a lot of PR now about it and you're shooting a music video. So it's good.' "