Rihanna overwhelmed by McCartney

Rihanna "can't believe" she got to perform with Sir Paul McCartney.

The 26-year-old singer took to the stage with the former Beatle and rapper Kanye West to perform their new song FourFiveSeconds at the 57th Grammy Awards on Sunday night. And despite collaborating with famous faces numerous times throughout her career, the Barbadian beauty couldn't contain her excitement at working with the British musician.

"What a night! Still can't believe we @kanyewest shared a stage with a f***ing BEATLE tonight! #bucketlistsh*t Thank you Sir @PaulMcCartney (sic)," she tweeted.

Rihanna wasn't the only star to take to social networking sites to comment on the event.

Madonna, who also performed a new track during the evening, posted a racy shot of her grabbing her black bustier covered chest.

"Holding on to MY Grammy's! #livingforlove #b***himmadonna (sic)," she wrote. The Material Girl quickly followed it up with a photograph from her routine and added: "Thanks to all of my #rebelhearts who made the Grammy's possible!#livingforlove (sic)."

Madonna had a number of famous fans share their thoughts on her incredible performance. Into The Woods actress Anna Kendrick couldn't help but gush over the fact she had the chance to see her idol belt out vocals up close.

"Madonna's performance is blowing my mind already and so far I can only see the stage hands (sic)," she wrote.

The 29-year-old also kept her fans updated on the celebrities she was sitting near at the ceremony.

"Directly behind Nicole Kidman dancing to "Evil Woman." They should have sent a poet (sic)," Anna added.