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Katy Perry talks about losing her virginity, praying for big boobs, Russell Brand, John Mayer, aliens, smoking weed and President Obama in a new GQ cover interview.

The singer says her ample breasts are heaven-sent.

“I lay on my back one night and looked down at my feet, and I prayed to God. I said, ‘God, will you please let me have boobs so big that I can’t see my feet when I’m lying down?’” recalls Perry.

When she was 11, “God answered my prayers,” she tells the magazine, looking down. “I had no clue they would fall into my armpits eventually.”

And Perry’s body is completely natural.

“I’ve never had any plastic surgery,” she informs GQ. “Not a nose, not a chin, not a cheek, not a t**. So my messages of self-empowerment are truly coming from an au naturel product.”

One natural product Perry has no use for is marijuana.

She says, “The weed — I’m not friends with it. I can’t do that stuff. I’d be like in the corner: ‘Are you trying to kill me?!’”

Perry believes in extraterrestrials and explains to GQ, “I see everything through a spiritual lens… I believe in a lot of astrology. I believe in aliens. I look up into the stars and I imagine: How self-important are we to think that we are the only life-form?”

She jokes, “I mean, if my relationship with Obama gets any better, I’m going to ask him that question. It just hasn’t been appropriate yet.”

How close are she and the President?

“I might have won Wisconsin for him,” she says. “Actually, I didn’t do too much, but he called on me a couple of times. Which was very nice.”

Someone else she had limited contact with was then-husband Russell Brand, who Perry says never once visited her during her massive Teenage Dream tour in 2010.

Things with current boyfriend John Mayer are better.

“I think that I needed to grow up,” she tells GQ. “I’m just having a wonderful experience with a wonderful guy. There’s no rush.”

Perry says that she lost her virginity at 16 in a Volvo while listening to the Jeff Buckley album Grace.

“Love that record so much,” she says.

Of course, sex plays a role in many of Perry’s performances, including her controversial geisha-inspired “Unconditionally” routine at last November’s American Music Awards.

The pop star says that the performance was inspired by her love of Japan, which she calls “the capital of adorableness,” and that it fit her theme of “unconditional love.”

“Geishas are basically, like, the masters of loving unconditionally,” explains Perry, although, as the GQ writer notes, the courtesan-patron relationship is actually fairly conditional.

Following the fury over her performance, including charges that it was racist, Perry claims she was misunderstood.

She says, “All I was trying to do is just give a very beautiful performance about a place that I have so much love for and find so much beauty in, and that was exactly where I was coming from, with no other thought besides it.”

Photo Credit GQ