ABC's critically-acclaimed and award-winning reality show Shark Tank has announced the addition of three new Guest Sharks including Charles Barkley, Matt Higgins and, for the first time, former Shark Tank entrepreneur-turned-Shark, Jamie Siminoff. After his debut in the tank in 2013, Siminoff went on to sell his invent…- From Mark Burnett, executive producer of Survivor and The Apprentice, and Sony Pictures Television, comes Shark Tank, an exciting, new reality show that gives budding entrepreneurs the chance to make their dreams come true and become successful -- and possibly wealthy -- business people. But the entrepreneurs must firs…