Eren Toben and his friend Daniel Mueller, both 20, killed the expectant mother Maria Peiner, 19, in a wood.
While Maria was telling friends she was excited to be a mother as she reached her eighth month pregnant, Toben and his henchman were plotting a brutal attack.
The pair said they were going shopping for baby clothes with Maria.
But when they got to the woods, Toben hit Maria with a piece of wood and stabbed her with a bread knife.
He then poured petrol over the terrified youngster and set her alight.
Sentencing the sick pair, Judge Regina Alex said: “She was still conscious, it could have been 10, 20, 30 seconds – she was still moving.”
The body was discovered by a walker the following day and the two men were soon arrested.
Toben”s fingerprints were on the handle of the knife found near Miss Peiner”s remains.
The pair remained silent as they were both jailed for 14 years for the shocking crime, which took place in the outskirts of Berlin.
Talking of Toben, the judge said: “For him the crime was a solution, he wanted a free, happy life which he had control over.
“He abused Maria’s love for him to lure her into an ambush.
“He acted for the sole purpose of taking pleasure in the destruction of another human being’s life.”
Speaking after the trial, Maria’s brother said: “I hope that our family can finally have some peace.”