"LES MISERABLES” star HUGH JACKMAN credits his Oscar nomination and marital happi­ness to a life-changing, behind-the-scenes helper.

The 44-year-old actor says motivational speaker and life coach Tony Robbins gave him the courage to tackle the demanding material of the screen musical.

“Tony really transformed my life,” Hugh recently told an interviewer.

The Australian hunk is such a devout follower that he’s completed a number of Robbins’ self-help seminars and has reportedly even participated in one of his famous fire walks – a controversial practice in which the self-help guru encourages followers to overcome their fears by walking over hot coals. And that guidance has apparently worked wonders for the dad of two adopted kids with wife Deborra-Lee Furness, 56.

“Hugh’s career has never been hotter, plus his marriage is stronger than ever – and Hugh credits Tony,” said an insider.

The two men struck up an unlikely friendship when Hugh sought him out after winning the role of a lifetime, Jean Valjean, in the big-screen version of “Les Miserables.”

“Hugh was overwhelmed by the anxiety of having to sing and act the lead,” said the source. “But with Tony’s support, he knocked the role out of the park.”

Hugh is not alone in his admiration of Robbins, who’s also reportedly counseled Mother Teresa, Bill Clinton and Nelson Mandela.

“The confidence Hugh gained affected ALL areas of his life – even putting more of a spark in his love life,” noted the source. “And he says Tony’s advice has even helped him come to terms with his father Chris’ Alzheimer’s disease.

“Whether it’s preparing to give speeches at awards shows, figuring out how to recharge the passion in his marriage or clearing mental blocks, Hugh swears by Tony.”