The answer to both is an emphatic yes. Existing laws can help insure privacy, but the time has come for some creative thinking about other possibilities. Everyone, even the most famous people, can use laws against trespass to prevent intrusions on private property and the law of libel to protect against intentional or reckless falsehoods.
Most states provide other protections as well.
It is generally grounds for a lawsuit, for example, if someone intrudes on your private domain by eavesdropping electronically or wiretapping. The law also prohibits using a celebrity's name in advertising without permission. A cereal company cannot claim or suggest that Michael Jordan enjoys its product unless Mr. Jordan agrees. A newspaper can be sued if, for example, it prints a photograph of two famous people at dinner and wrongly implies that they are romantically involved. Many states also restrict public disclosure of private facts, even if what is said is true.