Popsugar Celebrity Grammy Awards Celebrities at Grammy Awards Afterparties 2015 Club Going Up! See the 20 Best Snaps From Grammy Awards Afterparties February 9, 2015 by Britt Stephens View On One Page Photo 19 of 20 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 19 Mark Ronson, his sister Samantha, and their stepfather, singer Mick Jones, hung out together at the Warner Music party. Previous Next Start Slideshow Katy PerrySam SmithGrammy AwardsAward SeasonAfterparty