Stop us if you've heard this one: Jennifer Lopez hooks up with a hot Latin backup dancer. But it's not 2001, it's 2012, and J. Lo is rebounding from her divorce from Marc Anthony. And this time around, it's 24-year-old Casper Smart who the now-42-year-old singer's calling "Papi." Hey, at least if she's going to make the same mistake twice, she's going to trade up for a younger, sexier version.