Christina Aguilera is "Stripped" again ... showing some skin for the October issue of Maxim!

The singer and judge of "The Voice" is flaunting her skinnier figure on the cover and inside the mens' magazine, where she also reveals one of her biggest turn-offs and talks a little about her "Mickey Mouse Club" days and former costars.

While flaunting major cleavage in a red satin dress and in little more than a white button-down and black bra for the cover, Aguilera is looking better than she has in a while.

"I'm such a down-to-earth girl, I'm comfortable in just a jersey and boy's underwear," she tells Maxim. "Trying too hard to be sexy is the worst thing you can do. Sexiness should be effortless."

And while that may be the worst thing a woman can do, she has something else in mind for men.

"The quickest way for me to feel weird and run for the hills is if somebody sits down and serenades me with a guitar. It's not my thing," adds Christina ... who's been linked to "Burlesque" PA Matt Rutler since the movie's 2010 release.

While Christina doesn't talk too much about her "MMC" days, Maxim asked who was cooler back in the day: Justin Timberlake or Ryan Gosling.

"They were both very charismatic, but I think I have to shy away from the question. I don't want this to bite me in the butt later," she says. "They were tight, you know. They'd walk around together all the time, same as me and Britney [Spears] would. Now look at us. It's funny how that played out."

Check out more from Christina's interview when the October issue of Maxim hits newsstands September 17 -- and see some shocking "Mickey Mouse Club" Then & Nows below!

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