Derek, instead, was spotted cozying up to a mystery brunette on the beaches of St. Barths.
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According to media reports, the pair seemed close while hanging out on the beach (see the pictures here), with the "Dancing With The Stars" pro giving his lady friend a few tight hugs.
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Derek's holiday week began in a stark contrast from Kate's — as he vacationed on the sunny beaches of the Caribbean, the newly separated Kate vacationed with family in chilly Aspen.
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Perhaps their choice of New Year's destinations is simply a metaphor for Derek and Kate's rumored relationship — hot and cold.