Kylie, 18, and Tyga, 26, arrived together at the premiere. And the "Keeping Up With the Kardashians" star stayed close to the rapper throughout the evening, reported E! online.
At one point, Kylie also kissed Tyga on the cheek and whispered something into his ear.
The duo had recently split in May. However they were spotted hanging out last week and have been giving hints of reconciliation.
West's wife, Kim, sister Khloe and Kourtney Kardashian, and mother Kris Jenner also attended the event.