"highly famous" is correct and usable in written English.
You can use it when you want to emphasize how much something or someone is known for being famous. For example, "She is a highly famous actress, having starred in many blockbuster films."
All the famous, highly publicized championship teams of recent seasons were thrown down and replaced by young teams.
(Dec. 6) 4. AT OKLAHOMA, THE GAME IS IN THEIR BLOOD The daughters and sisters of highly accomplished and famous athletes are lending the Sooners' women's basketball team skill, athleticism, visibility and celebrity.
That's why we were excited when we heard Gold was reviewing two of the most famous, highly regarded restaurants in the world for this month's Wall Street Journal Magazine.
But what about the everyday users, who aren't famous and highly visible actors?
In the two years since they published their first work, they had become relatively famous and highly controversial.
Television credits include Traffik and GBH Duncan on Duncan: On being highly regarded without being famous; "Long may that last.
Famous and highly esteemed in his day, very little substantive information remains on High Renaissance Venetian painter, Giorgione.
The result was the fleetingly famous and highly controversial Compact of Fifth Avenue, so-called after the location of Mr. Rockefeller's apartment.
In a strange coincidence, the molten effect of the sun on Horsetail Fall resembles another famous and highly photographed firefall here, one involving actual fire.
His zeal caused him to be attacked, presumably by a Catholic writer, in a famous but highly distorted exposé of his character known as Leicester's Commonwealth (1584).
