Cleavage has so many functions. It can be used to obtain free drinks. It can be used to get inside information from nerds in movies. It can also be used to get big tips if you're a waitress or bartender. Most importantly, cleavage can be used by hot lesbian women to lure another really hot lesbian into three-hour muff rubbing session that is secretly taped and used for sale on the internet. That's probably its most useful function.
#10 Hillary Duff's Cleavagefest - You can almost see the nipples trying to reach around the top of her dress.
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#9 Old School Britney Cleavage On Punk'd - It's just ... she was so ... dammit, what the hell did this chick do to herself!