Top 10 Famous and Fabulous Sister Acts
The Olsen twins

The Olsen twins most definitely made our list. See who else we highlighted.

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Some families just seem to have an abundance of talent, business smarts and beauty. Whether we're trying to guess who's the oldest sister or who's the most talented (or demands the biggest paycheck -- or is the diva -- or is the hot one), our fascination with celebrity sisterhood is making the sister-sister guessing game a favorite national pastime.

There's something about the glare of the spotlight that can ruin the carefully laid plans of the most expensive publicist, though, and a few of these pairs may be wandering into the territory of America's most irritating. But for now, we're frankly fascinated and wondering what these famous, fab sisters will get up to next.