Insiders spilled that the 44-year-old went backstage after Kardashian had finished the speech and he had already seen the monologue during rehearsals.
The SKIMS founder introduced herself as Kim Kardashian West during the monologue and roasted her estranged husband.
Kardashian called West "the best rapper of all time" and said he was the "richest black man in America before joking, "When I divorced him you have to know it came down to one thing: his personality."
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Insiders previously told Page Six that the brunette beauty was "nervous" about hosting SNL but West was "quietly advising her on her performance, her opening monologue, even her costumes for the show."
Kardashian filed for divorce in February but the co-parents seem to be on good terms. She attended all three listening events for West's new album Donda and even partook in the third listening party when the pair recreated their wedding.
An OK! insider previously spilled that Kardashian could be having second thoughts about the divorce. "Kim still loves Kanye," the source spilled. "But as good as his intentions may be, he remains as erratic and unpredictable as ever."