Reese Witherspoon flashed a smile while out shopping at Neiman Marcus and Barneys with a friend yesterday in LA. She also stepped out earlier this week to do some solo shopping. It's a big week for Reese's family — her oldest son, Deacon Phillippe, has a birthday Tuesday, and her younger son, Tennessee Toth, is 1 month on Saturday. Reese may have belted out a rendition of "Happy Birthday" for Deacon, and it sounds like she may share her vocals with a larger audience. New reports suggest Reese may duet with Michael Bublé on an upcoming project. She's had success singing before, since her role in the music biopic Walk the Line won her an Oscar.