Jessica Alba -- Back on All Fours!

Jessica Alba
Back on All Fours!

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Jessica Alba celebrated the new year by rockin' a skimpy orange bikini which highlighted her bootyful round backside and her perky, taut front side in Cabo on Wednesday.

It's been eight years -- and two kids -- since she infamously bronzed her glorious God given talents in this amazing shot from 2005, butt we still gotta ask ...

0102_jessica_alba_butt_bauer The 31-year-old actress is one hot mama.