Rugby league star Brett Stewart has been found not guilty of sexually assaulting a 17-year-old girl.

Stewart, supported in court by his girlfriend Jaime Baker, his parents, family, friends and teammates broke down and cried as the Sydney jury of five women and seven men returned its verdict after less than two hours of deliberation.

Brett Stewart arrives at Downing Centre District Court. Credit:Nick Moir

Stewart, 25, pleaded not guilty to two counts of indecent assault and a charge of sexual intercourse without consent over allegations he tongue-kissed and digitally penetrated the girl.

The alleged assault occurred outside Stewart's Manly home on March 6 last year, after he caught a taxi home following the Sea Eagles' season launch.