Rihanna once belted out "Just Live Your Life," but motherhood these days has her wanting to switch places with her young sons! The "Don't Stop the Music" songstress shared her wishful thinking ...

Michael Buckner/Variety via Getty Fans have been patiently waiting on R9 for years — and so has Rihanna, as she's been mulling over the right ideas for new music ... "I don’t have the songs ...

In the movie's trailer, Rihanna can be heard singing her hit song "Please Don't Stop The Music" and a cover of Belinda Carlile's "Heaven Is A Place on Earth." You can check out the full trailer below.