Source: Jessica Derschowitz / CBS News Sean Kingston was all smiles as he arrived at the Teen Choice Awards, his first public appearance since recovering from injuries he suffered in a jet-ski accident in May. The "Beautiful Girls" singer, 21, sported jeans, a white T-shirt, red vest and gold jewelry as he walked the red carpet on Sunday. Kingston recently opened up about the near-fatal accident, which happened on May 29 when he crashed his watercraft into a Miami Beach [...]