It seems like Kyle and her sister Kathy Hilton have made a truce. Their relationship has had its ups and downs, with the sisters feuding over things like Kyle's show American Woman, among other things. Kathy was seen on social media singing at the party.
She also seemed to be soaking up the rays as she entered the new decade of her life. Days before her big party, she shared this picture of her lying on the beach, showing off those taut abs in a bright yellow bikini.
Photo credit: Getty
What do you think about Kyle's bash? Let us know in the comments.