Katie Beckinsale
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Should you be as lucky as Kate Beckinsale and have thick, medium length hair; you too can wear a ponytail like this one for a formal affair.  Kate may have some natural body in her hair so when it is pulled together and banded, it will turn under naturally.  Hair that has been cut with an "undercut" will also fall this way.   Should your hair need some coercing, touching up with a curling iron will certainly do the trick.  Her thick mane fans out for ready-made fullness.   A fancy band or jeweled pin at the site of the band is an option, though in this case, her lovely earrings give plenty of glamour in contrast to her rich, brown hair.