"Congrats to my beautiful sister and fiancé!" Kenya, 48, wrote on Instagram alongside a photo of Mike, 48, proposing to Cynthia, 52. "You deserve your happily ever after!"
"'To find a wife is to find a good thing,'” she continued. "Love you both!"
"Thank u!" Cynthia responded in the comments section. "We love u sis."
Mike proposed to Cynthia while the Bravo cameras were rolling on Friday night.
He got down on one knee at an event for the opening of Cynthia's wine store called Bailey's Wine Cellar.
Cynthia went social media official with Mike late last year. Talk show host Steve Harvey was the one to introduce them.
Her sportscaster beau made his debut on RHOA last season.