Rihanna was "so shocked" to win a Grammy award last week.

The 25-year-old singer wasn't at the ceremony when she won the prize for the Best Urban Contemporary Album for her 2012 release Unapologetic, but she admits she was stunned when she found out: "I was so shocked. Really, I was at home and one of my friends hit me and said, 'You've just won a Grammy,' and I was like, 'What?' and when I went on the internet I just saw Unapologetic. It was quite an emotional moment surprisingly. But I was in shock, I'm excited, it was a good feeling to still be that excited at this point in my career."

The "Stay" hitmaker was later spotted at The Young Money Cash Money Records party at Greystone Manor with her rumored boyfriend Drake. However, there may have been some awkward moments in between her partying as her rival Karrueche Tran was also in attendance.

Both Rihanna and the aspiring model have had on/off relationships with Chris Brown - who was convicted of assaulting the "We Found Love" singer in 2009 - and have previously had a war of words on Twitter.