In case you're unfamiliar, the former Beatle's been popping up all over the pop music landscape lately. First, he featured on Kanye West's surprise New Year's single, "Only One." Then, he grabbed another featured credit, along with Kanye, on Rihanna's lead #R8 single, "FourFiveSeconds."
And now, Paul's showing up all smiiiiiiley in his chambray button-up in a couple of new photos on Gaga's Instagram feed.
Per the "Applause"singer's caption, they're in the studio, working on "one of [Paul's] many secret projects."
Perhaps this secret project is somehow related to Kanye's "Only One"? Is McCartney heading up some kind of insane collaborative project with all of music's brightest stars? Or, is he just "doin' Paul"?
Stayed tuned for the next installment of McCartnaissance Mystery Theater.