Chris Rock and Will Smith exchanged words – and a slap that was real or fake, no one's real sure at this point – on a wild Oscar night. Smith got heated at Rock for telling a "G.I. Jane" joke at the expense of wife Jada Pinkett Smith. Last summer, Jada said she went bald after opening up about her alopecia journey and severe hair loss. Alopecia is an autoimmune skin disease that can cause hair loss on the scalp, face or other areas of the body, according to the American Academy of Dermatology Association.  For more on what happened at the Oscars, visit the link in our bio.