Is Tiffani Thiessen secretly yearning to return to 90210 as bad girl Valerie Malone? "I don't think so, I mean I wish them all the luck, but I'm just so in a different place right now," Thiessen, 34, told Usmagazine.com at the Nike + Human Race in L.A. on Sunday. "You know, it's not that I don't look back at that show with wonderful, amazing memories, but I've just gone in a different direction...