hubby-sitter
n.— «The singer has hired a male nanny to keep Kevin Federline out of trouble with girls, booze and bar fights. In America, they call him a “hubby-sitter.” In Britain we’ve got another name for it. Sneak.» —“Manny Nanny” by Sue Carroll Mirror (U.K.) May 10, 2006. (source: Double-Tongued Dictionary)