Sandra Bullock stepped out of her LA office and into her car yesterday afternoon. She logged a day at work following a fun holiday weekend with her son, Louis. The pair were seen having fun at a young friend's birthday party, which was equipped with balloons, games, and more. Sandra and Louis have been taking advantage of their West Coast location to catch up with pals, including Ryan Reynolds. Ryan even accompanied them on a jaunt to Wyoming, where the trio were seen on a hike in the Grand Teton Mountains.