Whitney (or Evil Brittany or Anti-Brittany) is Brittany's evil counterpart. She possesses Brittany's talent for leadership, but nothing else positive, she is a ruthless leader. A sadist in every sense that Brittany is compassionate. She is just as destructive as Melvin. In The Chipmunk Multi-Verse she rules the Darkmunk Universe as an Equal to Melvin and they also seem to agree on many things (unlike the Good Counterparts). She has the Dark Element of Electricity, and uses it to further her rule, She has totally mastered her Power. She also has the power that she can reprogram anyone's personality by shocking them.
The 80's design and 2000's design is pictured on this page, but it is unknown if an Alvinnn and the Chipmunks version will be rendered. Though Brittany has been seen dressed in a similar style in the episode Albrittina.