Jessica Alba Back on All Fours!

1/3/2013 6:15 AM PST
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 ...

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