THIN DISCIPLINE

HUGH Jackman isn't a diva - but the "Australia" star has to stick to a strict regimen to get in shape for the new "X-Men" flick. So, for the first time, Jackman has a backstage rider spelling out his dietary needs. When People magazine's Sexiest Man Alive went to London to promote his and Nicole Kidman's "Australia" earlier this week, he was served a carb-free meal at the premiere party at Odeon in Leicester Square while everyone else was nibbling on bread rolls.