Ky had been Snapchatting all the way up until Pia's big moment when she stepped on stage and was greeted by an eruption of cheers, but what she didn't expect was to have the crowd cheering for her, too.
Kylie and Pia have been spending a lot more time together lately and the two frequently pop up in each other's Snapchat videos...like this one, that Ky posted late last night where they're (sorta) singing together:
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Gallery | Read Her Lips: Kylie Jenner Memes