The rapper and his collaborator Jay-Z took home prizes for 'Best Group' and 'Video of the Year' at the ceremony, which was held in Los Angeles.
© Rex Features / Buzz Foto
Kardashian later took to her Twitter page to congratulate West, whom she has been dating for a few months.
"I'm so happy for my baby tonight!" she wrote. "Dope performance & won some BET Awards!"
Kardashian attended the ceremony and was seen sitting with West, Jay-Z and Beyoncé, who took home the award for 'Best Female R&B Artist'.
The awards also saw D'Angelo making a comeback and an emotional tribute to the late Whitney Houston.
Photo gallery - 2012 BET Awards red carpet:
Copyright: WENN FayesVision
