Gwen Stefani and Blake Shelton have been going strong for over four years now. The couple began dating in 2015 and they continue to set goals for every pair out there. Recently, Gwen Stefani joined beau Blake Shelton on stage at LA Concert and took everyone by awe as they performed their duet Nobody But You. Gwen Stefani has three kids with her ex-husband Gavin Rossdale who had their share of fun at backstage.