Perry took to Snapchat to document the wild revelry, posting a video of her blonde-haired boyfriend and the rest of the group rocking out to Avril Lavigne's "Complicated," with the caption, "This is what the holidays looks like."
Farrow later shared a video of the entire group, with Perry behind the mic, singing their rendition of Alanis Morissette's "You Outta Know."
Karaoke's always a fun time, but it seems like it might be a little intimidating to be the next one up after Perry's had her turn.
Recently, ET caught up with the "Rise" singer at the UNICEF Snowflake Ball in New York City, where she opened up about her handsome beau and marveled at how supportive he is toward her charitable endeavors. Check out the video below to hear more.