"Bash and His Daddy," the model, 32, captioned one cute picture, in which the rapper is giving little Bash a smooch on the lips.
Both Khalifa and Sebastian are wearing printed onesies in the touching image.
One short video clip that Rose shared shows the little boy shaking his booty as Khalifa laughs and dances along from his seat.
The pair announced their decision to split in September 2014, and after several months of ugly fallout, have been spotted out partying together and remain amicable.
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