Debrett's, which today made its People of Today list available online for the first time, said Richard E Grant disclosed that he enjoys making dolls houses and Michael Gambon admitted collecting guns and making clocks.
John Cleese confessed that he spent most of his leisure time indulging in gluttony and sloth.
People of Today lists the UK's most influential 25,000 people.
New additions this year include Wimbledon semi-finalist Andy Murray, DJ and music producer Mark Ronson and Paralympic swimmer Eleanor Simmonds.
Debrett's People of Today, an annual publication formerly known as Debrett's Distinguished People of Today, is a rival to Who's Who.
It catalogues the biographies of Britain's most distinguished figures including peers, academics, writers, business leaders, civil servants, clergy and politicians alongside those of men and women from the worlds of the arts, the media, fashion, music and sport.
An additional feature is the correct style of address to be used when addressing correspondence to an entrant.
Like its rival publication the British Who's Who selection of entrants is at the Editorial Team's discretion and there is no payment or obligation to purchase.
However, unlike Who's Who, entrants are removed if they are no longer deemed to be suitable for inclusion.
