It's no secret that many of Hollywood's A-listers have breast implants. But what you may not know is that as popular as the cosmetic enhancement is, celebs also aren't afraid to say goodbye to them for good. Dr. John Paul Tutela, a trusted NY and NJ board-certified plastic surgeon tells Us Weekly that the two main types of breast implants are saline and silicone. "They each have their own characteristics and percentages of certain complications that sometimes require the removal of an implant," says the expert.