yes they were friends
Trump noted on Fox & Friends that he attended Houston’s wedding with Bobby Brown, speculated about the marriage’s impact on her voice and health, and claimed she worked for him multiple times. He told HLN that Houston visited Mar-A-Lago on “numerous occasions” and said he “knew her well.” He also discussed Houston’s wedding, voice, addictions, and marital reality show with Access Hollywood and The Wendy Williams Show in the days following her death, which just so happened to occur one week before the fifth season of Trump’s show Celebrity Apprentice premiered on NBC.
https://www.spin.com/2018/10/today-we-learned-donald-trump-and-whitney-houston-were-friends/