BobNewhart.com was registered back in 1997. The domain name did not appear to be owned by the legendary actor and comedian. It seems it was owned by a Rob Newhart from Perdiem Consulting. The auction closed at $4,688 at GoDaddy auctions.
Interestingly when looking at Archive.org the website did have a picture of Bob Newhart in a sweater with links to his official Facebook and Twitter accounts.
When you look at the Twitter account you see that the profile links to BobNewhartOfficial.com.