The main headline to spring from the latest Billboard Top 200 is, of course, Rihanna nabbing her first-ever #1 debut with Unapologetic ... but, just a few slots below her, making the week's second-biggest bow, was Phillip Phillips' The World From the Side of the Moon.

Phillips' post-"American Idol" debut sold 169,000 copies in its first week of release, landing at #4 ... and while he couldn't quite match the chart-topping debut of the previous "Idol" champ (Scotty McCreery's Clear As Day sold 197,000 copies to claim the #1 spot last year), Moon still posted the second-biggest first-week sales for an "AI" winner since David Cook in 2008.

But the way things have been going for the unassuming Phillips ever since winning "Idol," well, he's gotten used to these kinds of things. Well, sort of.

"Yeah man, there's been a lot of moments; I've been in the same room as all these famous people, and I'm like 'What the heck am I doing here?!?' I played the One World concert, all those amazing artists were in one place at the same time, and it was overwhelming," he told MTV News. "But meeting those people was just awesome. I met Dave Matthews, he was a great guy, and it was just interesting to see how, from a year ago, just watching TV, watching some of my favorite bands or favorite actors, and now I'm in the same room as them, it's just weird."

Of course, he owes a lot of his success to his double-platinum debut single, "Home" which has taken on a life of its own since Phillips first performed it on "Idol" ... though, he's not even thinking about the commercial aspects these days.

"It's been overwhelming. It's changed my whole life. It was in the Olympics, movies, commercials, who knows what else," Phillips said. "But it's done so well and it's helped so many people out; you know, I've seen it's helped the Hurricane victims and I've seen life situations where it's helped people out ... people really seem to connect to it, which is, man, it's amazing."

So with his debut album firmly entrenched in the Top 10, and a hit single under his belt, Phillips is gearing up for the next phase of his career: His first headlining tour ... but, as you'd probably expect, he's approaching it in much the same way he approaches everything else: with humility.

"The tour is in the works, it's going to happen early next year, like around February or so ... we're still planning it out, I think we're going to keep it just me and the band, doing something like that," he said. "It's going to be a lot of fun and, y'know, I'm just hoping people will want to come out to it."

Will you come out to see Phillips on tour? Let us know in the comments below!