TV's Worst Significant Others: 'Mad Men's' Don, 'HIMYM's' Robin and more

(The CW)
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Adrianna Tate-Duncan, '90210'

Played by: Jessica Lowndes

Why we'd dump her:She's the classic bad high school girlfriend, if all bad high school girlfriends were pop-stars. Her frequent attempts to turn over a new leaf have all found her relapsing into mind-bogglingly selfish ways.