Katy Perry's Best 'MTV First' Moments ... So Far!

Singer will premiere 'Part of Me' video on Wednesday, March 21, at 7:23 p.m. ET on MTV.

Katy Perry will sit down with MTV News on Wednesday, March 21, to premiere her emotional, feisty clip for "Part of Me" during "MTV First: Katy Perry." The premiere takes place at 7:23 p.m. ET on MTV, and it's followed by a 30-minute chat with MTV News' very own James Montgomery, airing live on MTV.com.

The singer, however, isn't a "First" newbie. Perry sat down with Sway Calloway in March 2011 to premiere the Floria Sigismondi-directed "E.T." video, and afterward she opened up about the spacey clip. She later won the Best Collaboration VMA with Kanye West for the video.

So before she sits down with MTV News for her latest "First," let's reflect on the best trivia we learned from her candid first one.

How did Katy end up recording the super-trippy "E.T."?

"I'll tell you, it's funny ... this song, I remember writing with Max Martin and Dr. Luke, and there's this producer they wrote with, named Ammo, and they were just showing me different samples of songs or tracks or beats, and they accidentally pulled up this beat, and it was for Three 6 Mafia," Perry said about the song, which is about falling in love with an alien. "I heard it and I always knew I wanted to write this futuristic, alienistic song, and they pulled it up and I was like, 'Wait, I can wrap my head around this. I know this seems like a long shot, but I think I have the perfect material to put on top of this sound.' And I did, and it really worked out perfectly."

How did she end up looking like a sexy alien creature in the video?

"It was, like, five and six hours, each makeup look," Perry said. "It was hard for me! It was really a patience thing for me on this video. But, you know, it's like when you're doing a film. Sometimes you have to do prosthetics, and you have to get really old or turn into an animal or a monster — and that's kind of what this process was."

Would Katy ever travel to space?

"I'm so into extraterrestrial stuff. ... It's very difficult for me to look up into the sky in the middle of the night and not think that our planet is one of ... a bajillion. It's really, really small," she said, later sharing that she had plans to travel to space with her then-hubby Russell Brand.

Well, with the singer always saying and doing the unexpected, Katy Cats should expect even more memorable moments this time around.

"Part of Me" is the lead single off of her March 27 album release, Teenage Dream: The Complete Confection, which she will also talk about, as well as her forthcoming concert movie, "Katy Perry: Part of Me."

Perry's fans can get in on the action of her "MTV First" by submitting video or text questions via Twitter (using @MTVNews / hashtag #MTVFirst or #KatyQ).

Before the premiere of "Part of Me," a tease of the clip will air on "VH1's Big Morning Buzz Live" on March 21 at 10 a.m. ET/PT, giving fans a taste of what they can expect from Katy in the video. In the super-fast teaser, Perry is channeling her inner Marine. A few shots of guns and night vision preview boot camp for the singer. The sneak peek closes on Perry's face painted in camouflage makeup. She shot the video on a military base in California in February.

Immediately following the premiere of "Part of Me" on MTV, the video for the deeply emotional single will air on Logo, debut on MTV.com, VH1.com and LOGOtv.com, and go into rotation on mtvU, MTV Hits and AMTV the following morning. Additionally, the video will debut on Saturday, March 24, at 9 a.m. ET/PT during VH1's "Top 20 Countdown" and on TeenNick's "Obsess This" music block at 7 a.m. ET and Sunday, March 25, at 8:30 a.m. ET.