As we have well-chronicled, Jennifer Lopez at age 46 has not only appeared to stop aging, she seems to somehow be doing it in reverse. If she isn’t twerking all over the dance floor at awards shows she’s risking nip-slips on various holidays. That’s the kind of stuff you don’t see too many 46-years-olds doing these days (nor usually want to see). I mean just look at her here at the after party for the opening of her new “All I Have” residency at Planet Hollywood in Las Vegas. It’s just ridiculous. Whatever she, Christie Brinkley , Elizabeth Hurley , Salma Hayek , Carmen Electra and others like them are doing I wish they’d bottle it and sell some of it to the rest of us. So, uh, anyway, when’s that rumored sex tape gonna hit the market? Asking for a friend.