John Mayer is considered one of the ‘Dating Expert’ in Hollywood as after going around with Jennifer Love Hewitt and Jennifer Aniston to Jessica Simpson, Taylor Swift and Katy Perry he is again in the news with his new love lady Demi Lovato. They both were spotted many times roaming in Los Angeles and recently they both were seen on Sunday night at West Hollywood hotspot Catch, a new seafood-focused rooftop restaurant and bar having dinner.