Tom Cruise has been given great news as he launches MISSION: Impossible III worldwide - he's Hollywood's most powerful star. The movie star has been crowned the cinema's top actor on Premiere magazine's 2006 Power List. Cruise, who features on the cover of the film magazine's June (06) issue, is ranked 13th overall on the newly-announced list, while newcomer Reese Witherspoon is the most powerful actress at number 29 - replacing Julia Roberts as Hollywood's top lady for the first time in 11 years. Another Power List debutante, Keira Knightley, is the youngest person on the new poll - coming in at number 45. The Lord Of The Rings director Peter Jackson falls from the top spot to 11, while movie mogul Steven Spielberg ranks high at number four. The number one spot on the Premiere Power List belongs to animation bosses Steve Jobs and John Lasseter.