Gentlemen Prefer Brunettes

What is is about flaxen-haired ladies that seems to turn the heads of Hollywood's hottest male stars? Certain celebrities just can't seem to quit blond women (Ryan Phillippe, Spencer Pratt, we're looking at you two.) But some celebs with blond track records have switched it up and found love in the arms of dark-haired beauties. Let's take a look at a few who have made the switch.

Ashton Kutcher may have dabbled with blondes like January Jones, Amy Smart, and Brittany Murphy in the past, but when it came to settling down it was all about the dark-haired Miss Demi Moore.

Brad Pitt is Hollywood's golden boy, and for a long time it looked like he preferred golden girls like Gwyneth Paltrow and Jennifer Aniston.

But now Brad has taken a walk on the dark side with Ms. Angelina Jolie. He's also stopped frosting his tips. Big improvement.

Justin Timberlake had dated an impressive arrary of blond beauties, including Britney Spears and Cameron Diaz. But the woman who currently holds his affection is brunette Jessica Biel.

Sure, she's too pretty to work, but her haircolor is marvelous.

Nick Lachey arguably has blond hair to thank for his rise to fame. The former 98 Degrees boy bander became famous for his marriage to uber-blonde Jessica Simpson. The pair documented their relationship on the show "Newlweds," where Jessica's blonde hair — and all its stereotypical implications — was a recurring punchline.

Now Nick's affections reside with Vanessa Minillo, who keeps her hair a warm shade of brown. Unlike Jessica, she probably knows the difference between chicken and tuna.

Tom Cruise doesn't exclusively date blondes, but he did marry strawberry-blonde Nicole Kidman.

Now Tom is with Katie Holmes, whose dark brunette hair (and its various styles) has become something of a celeb-wacher's obsession.

One thing Tom doesn't like to switch up — women of stature. If you're tall, Tom's interested.

Billy Joel has courted some blonde stunners in his day (Christie Brinkley and Elle McPherson, anyone?) but his current wife, Katie Joel, keeps it dark.

No matter her haircolor, she's always a (hot, much younger) woman to you, right Billy?

Could it have been his nightmare divorce from blondie Heather Mills that sent Paul McCartney searching for love with brunettes? He's currently dating dark-haired Nancy Shevell.

Paul's mantra should be: no more blondes, and next time — get a prenup.

From Madonna to Robin Wright, Sean Penn does seem to have a thing for blondes. Yet now rumors are surfacing that he's courting Natalie Portman.

Sure it's all speculation, and sure both parties deny a relationship — but there's certainly something about Natalie that's caught Sean's eye. Maybe it's her keen intellect? Or maybe it's her lack of roots? Either way, if Robin Wright really wants to hold onto her man, she may need to find out what brown can do for her.