Jamie Silberhartz! The name doesn't ring a bell? It should, or will: A glorious career awaits, and tonight, another step in that direction, on "Private Practice." I'm championing Jamie because a.) she's from Stony Brook and making a go of it in the fun/brutal world of Hollywood; and b.) She was Rachel Blake in "The Lost Experience," which Lostiacs lost themselves in a handful of summers ago. She was terrific - but never got into the mother show. (Was also dispatched on "Dexter" last season; hey, it's a credit.) Her biggest supporter - her dad - tells me that on tonight's "Private Practice," she plays a character named Kendra Templeton, who's trying to conceive a child.