Cardi B and Stefon Diggs are practicing wellness-and philanthropy-as a couple. Source: Elsa / Getty The rapper continued her reign as her boyfriend's biggest fan by supporting him at a holiday wellness event at the New England Patriots' Gillette Stadium in Foxborough, Mass. on Monday, Dec. 15. The happy couple joined local mothers and their kids for the stadium's first-ever "Winter Wonderland Wellness" event, which was organized by the NFL star's nonprofit, Diggs Deep Foundation.