Jesse McCartney's Sweat Glands Not Created EqualS

Milan, June 27. Image via Bauer-Griffin.

What's up with sweating only from one's armpit anyway? Is it like the Early Man version of being "right brained"? Anyway, whoever Jesse McCartney is, he's at a fashion party in Milan looking like an Oklahoma State fratboy on spring break in the Bahamas so we sorta get why he's sweating.