Ashlyn Robinette / People: RHOBH's Bozoma Saint John Is Engaged to Keely Watson! Inside the Surprise Proposal with Over 100 Roses (Exclusive) - Saint John's custom-designed engagement ring has a total diamond weight of 8.43 carats - The Real Housewives of Beverly Hills star Bozoma "Boz" Saint John got engaged to Keely Watson on Aug. 29 in California