To the left, Barack Obama's GQ cover. Right, Leonardo DiCaprio's.

Mark Seliger / GQ

To the left, Michael Phelps' GQ cover. 'Mad Men' star Jon Hamm's is on the right.

Mark Seliger / GQ

In the issue, DiCaprio posed as a early 1900s boxer, and threw some verbal punches at the paparazzi. "I do not like the way they conduct themselves. I think they're disrespectful and dangerous," he said of overzealous photographers.

Mark Seliger / GQ

Michael Phelps' spread inside of his issue is sure to make ladies (and even men comfortable with their sexuality) admire his storied physique. But amid all that muscle is a fierce competitor. ""I just don't like to lose -- not in swimming, not in Monopoly -- ever," Phelps tells GQ.

Mark Seliger / GQ

For obvious reasons, Barack Obama made the cut for one of the covers. Unfortunately for GQ, he has more pressing things to do than comment on his cover, but we're sure he'd accept it with grace.

Mark Seliger / GQ

Jon Hamm had to wait quite some time for his 'Mad Men' fame. So what of today's troubled young stars? "I see actors in this town who make it big young. They don't understand the word no: 'What do you mean I can't kill this elephant, drop it on a car, set it on fire, and then snort it?'" he jokes.

Mark Seliger / GQ

Actress Megan Fox is the only non-male to make the cut, and you can probably see why. GQ dubbed her their Obsession of the Year. Check Out Megan's Stupidly Sexy GQ Photo Shoot

Richardson / GQ

John Malkovich's turns in 'Burn After Reading' and 'Changeling' reminded GQ of just how great an actor he is. Hence, he's the Mad Genius of the Year.

Mark Seliger / GQ

Sean Penn already has Oscar buzz for 'Milk,' so it's only right he's GQ's 'Drama Queen' of the Year.

Mark Seliger / GQ

Gordon Ramsay's incessant yelling and foul mouth make him the perfect candidate -- and recipient -- for 'Prick' of the Year.

Mark Seliger / GQ

Taking on a new persona is nothing new in the world of pop. Take Beyonce, who has created Sasha Fierce to allow her to "take more risks." Have you kept up with all the alter-egos out there? Flip through the gallery quiz, but start here. First Question: Who is Mimi?

Venturelli / WireImage

Answer: Mariah Carey

Next Question: Who is Luke the Drifter?

Kevin Mazur, WireImage

Answer: Hank Williams Sr.

Next Question: Who is Cherry KooKoo?

AP

Answer: Courtney Love

Next Question: Who is Chris Gaines

Peter Kramer, Getty Images

Answer: Garth Brooks

Next Question: Who is Damita Jo?

Urbano Delvalle, Time Life Pictures / Getty Images

Answer: Janet Jackson

Next Question: Who is Ziggy

Brad Barket, Getty Images

Answer: David Bowie

Next Question: Who is Slim Shady

Michael Ochs, Getty Images

Answer: Eminem, aka Marshall Mathers

Next Question: Who is Esther

James Devaney, WireImage

Answer: Madonna

Next Question: Who is Cornholio

Moshe Milner, GPO / Getty Images

Answer: Beavis

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