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As a formal dress, this show-stopping gown from KissProm is the epitome of modern elegance, making you feel confident and beautiful on your special night

With its mini length, striped pattern, and wide neck, this dress will make a statement at any event on your calendar

21: Bright + Casual Winter Wrap Dress When everyone else is dressed in cold weather dark tones, add a pop of color with this casual winter wedding guest dress

Practical Tips for a Flawless 21st Celebration Looking great means nothing if you feel miserable halfway through your celebration

"You really can't be too overdressed, short of wearing a white, floor-length dress yourself," says Mayer

keira-knightley-gucci-2006-pirates-premiere Keira Knightley in Gucci at the 2006 premiere of Pirates of The Carribean: Dead Mans Chest Dripping in liquid bronze, Keira Knightleys slick Gucci gown may have been slightly controversial at the time, but its 2000s-meets-2020s appeal makes it a winner in our books