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We love the sexiness known as Megan Fox...but that two toned hair and 35-year-old boyfriend of hers? Not so much!

We snapped the couple going for a walk in Santa Monica last night, and photogs tell X17online exclusively that the two got into a very intense argument right before these pictures were taken. One photog added, "It seemed that they had been having a very emotional discussion and Megan was visibly upset, even though Brian seemed fine."

Then again, the expression on her face might have had something to do with the icky color of her usually magnificent mane...if our hair looked like that, we'd be pretty pissed too!