Gwyneth Paltrow took to Instagram to share a cute snapshot of what looks to be her son, Moses, and his friends on Tuesday. The 42-year-old actress is enjoying what's left of Summer by soaking up the sun and flashing a cheeky smile while floating in a swimming pool. She captioned the photo, "Dog days are done #backtoschool," and it's just the latest in a ****** of pictures that she's been sharing of her and her precious children. See the fun picture above, then check out the best celebrity Instagrams of the Summer.