Newest Knick Isaiah Hartenstein and his fiancée Kourtney Kellar are on cloud nine after getting engaged during the offseason. Hartenstein, 24, proposed to the Los Angeles-based model on the beach in Malibu in April, just a week after his season with the Clippers ended, with a stunning oval-shaped diamond ring. Kellar, 31, announced the news in a post on her Instagram page, with a message written in her fiancée’s second language of German, that translated in English to, “Of course I said ‘yes.’”