If there’s anyone who knows about the pop star life, it’s Robyn.On BBC Live Lounge, the Swedish pop singer proved it with a mashup of the Teddybears’ Iggy Pop-assisted “Punkrocker” and Tinashe’s “Popstar.” Watch that all go down below.Robyn opened the performance with the first verse of “Punkrocker,” giving its iconic hook a new treatment by replacing “punkrocker” with “pop star,” before transitioning into the title track of Tinashe’s recent pop manifesto.Read more about why we love “Popstar” in Walden Green’s review....