Nicole Scherzinger is enjoying her downtime from "The X Factor" -- with a vacation to Mexico!

The former Pussycat Doll has been tweeting pics from her trip over the past few days, showing her going horseback riding, whale watching and having a relaxing spa day ... all while wearing her bikini.

Though she reportedly spent New Year's Eve with sometimes-boyfriend Lewis Hamilton, he was nowhere to be seen in any of her photos. Looks like it was just a girls' trip!

Either way, we're jealous. Check out her vacation pics above!

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