No Doubt will release their first album in 11 (!) years, Push And Shove, this fall. And in case you were wondering if they are really back or not, they took to Late Night With Jimmy Fallon to perform their upbeat, reggae-tinged new single. It's impossible to deny how comfortable they look playing with each other again, and as you'll seen when you watch the performance above, Jimmy Fallon is clearly a huge fan.