Kylie Jenner I'm Gonna Marry Tyga!

Kylie Jenner goes from breakup to "until death do us part" faster than anyone ... because she and Tyga are going to get married, and that's straight from her mouth.  

The recently reunited couple was out after the American Music Awards Sunday night when someone popped the question.

She did not hesitate with her answer ... if only we could see Tyga's face. 

Ah, young love.