<P> Princess Leia Organa of Alderaan ( also Senator Leia Organa or General Leia Organa ) is a fictional character in the Star Wars franchise , portrayed in films by Carrie Fisher . Introduced in the original Star Wars film in 1977 , Leia is princess of the planet Alderaan , a member of the Imperial Senate and an agent of the Rebel Alliance . She thwarts the sinister Sith Lord Darth Vader and helps bring about the destruction of the Empire 's cataclysmic superweapon , the Death Star . In The Empire Strikes Back ( 1980 ) , Leia commands a Rebel base and evades Vader as she falls in love with the smuggler , Han Solo . In Return of the Jedi ( 1983 ) , Leia leads the operation to rescue Han from the crime lord Jabba the Hutt , and is revealed to be Vader 's daughter and the twin sister of Luke Skywalker . The prequel film Revenge of the Sith ( 2005 ) establishes that the twins ' mother is Senator ( and former queen ) Padmé Amidala of Naboo , who dies after childbirth . Leia is adopted by Senator Bail and Queen Breha Organa of Alderaan . In The Force Awakens ( 2015 ) and The Last Jedi ( 2017 ) , Leia is the founder and General of the Resistance against the First Order . She and Han have a son named Ben , who adopted the name Kylo Ren after turning to the dark side of the Force . </P>
when do we find out luke and leia are siblings
In Return of the Jedi ( 1983 )