Uh-oh - here's Johnny

Johnny Depp and Will Smith topped a list of Hollywood's most overpaid actors, an illustration that star power does not always bring in dollars at the box office.

Fans' favourite George Clooney also found himself on the annual Forbes list after the limited commercial appeal of films such as Hail Caesar, Money Monster and the 2015 flop Tomorrowland.

Depp led the list for the second straight year after his movie Alice Through the Looking Glass brought in only $300-million at the global box-office after costing about $170-million to produce.

Forbes compiles the list by comparing the estimated pay for a lead actor in his last three movies to the estimated production costs and box-office gross of those movies.

It calculated that Depp, whose 2015 movie Mortdecai also bombed, returned just $2.80 at the box office for every $1 he was paid.

Depp, 53, who became one of Hollywood's highest-paid actors with Pirates of the Caribbean, also had a bad 2016 on the personal front.

His split from actress Amber Heard made headlines when the pair exchanged allegations of violence and blackmail that were later dropped. Depp paid out $7-million in a divorce settlement.

Concussion, the 2015 film about football head injuries that starred Smith, grossed only $13-million more than its $34-million budget. It followed disappointing receptions for Focus and After Earth and led to a $5 return at the box office for every $1 Smith was paid, Forbes calculated.

Clooney came in fifth on the list, with a box-office return of $6.70 for every $1 he was paid, largely because of the failure of Tomorrowland, which cost $190- million to produce.

Magic Mike star Channing Tatum and comedian Will Ferrell rounded out the top five on the Forbes list of the most overpaid actors.