Rihanna posted a picture to her Instagram account of her RIHearsals with Kanye West and Sir Paul McCartney in preparation for her RIHturn to the event's stage on Sunday.
The 25-year-old superstar shared a black-and-white photo of her RIHearsing with Kanye and Paul against a draped backdrop.
Former The Beatles legend, Sir Paul, also posted the picture but to his Twitter page, with the caption: ""Having fun rehearsing for the GRAMMYs!" @rihanna @kanyewest @TheGRAMMYs Photo by MJ Kim."
And the trio are set to perform Ri's track FourFiveSeconds live for the first time at Los Angeles' Staples Center.
Kanye West, who is to make his sixth appearance at the awards's how tomorrow, will also reportedly perform a 'never before seen' solo. And knowing Kanye we should expect anything to happen. Oh, maybe he'll bring his daughter North on stage?
Others stars to grace the stage will be Beyoncé, Common, and John Legend as part of a tribute to the movie Selma.
Singers Usher, Pharrell Williams, Sam Smith, Madonna, Ariana Grande, and Ed Sheeran will also perform at the 57th Annual Grammy Awards.
Who will win the most Grammys this year - what do you think?