Article continues below advertisementJustin Bieber will do anything for his pal Kendall Jenner - especially on her birthday.The pop star, 31, dedicated one of his songs "Devotion" to the model during her 30th birthday bash earlier this month.Kylie Jenner's look-alike pal Stassie Karanikolaou recently posted a vlog of Kendall's Caribbean event, which featured the pop star singing.Article continues below advertisementStassie's Vlog Gave Fans an inside Look at the PartySource: @StasKaranikolaou/YouTubeKylie Jenner's friend Stassie shared a blog from Kendall's party.