For Bay area beauty junkies (and visiting makeup lovers), a trip to the San Francisco MAC Powell street pro store (45 Powell Street, right down by Union Square) is a must, because when it comes to beauty shopping, it’s an iconic stop, tantamount to visiting the golden gate Bridge, Pier 39 or Lombard Street… When you’re in SF, if your schedule permits, you gotta do it! I stopped by yesterday to check out the new MAC studio Waterweight foundation and get some application tips. ANNONSE Studio Waterweight reminds me a little of my beloved Dior Diorskin nude Air Serum. It...