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Paris Hilton<\/strong><\/a>\u2019s son Phoenix<\/a> is growing up so fast and the A-lister can\u2019t help but gush over his milestones<\/a>. The celebrity DJ revealed on The Tonight Show Starring Jimmy Fallon<\/em> that the little one said his first word and it proves he definitely takes after his momma! The late-night talk show host asked the heiress if Phoenix\u2019s first word was \u201cmama,\u201d but she revealed it was something much more sliving than that.<\/p>\n \u201cNo, it was \u2018yas,’\u201d Paris, 42, replied. \u201cYas, wonder who he got that from.\u201d<\/p>\n The Simple Life<\/em> alum also shared that Phoenix, whom she shares with husband Carter Reum<\/strong><\/a>, is getting used to the jet-setting lifestyle like his successful parents. \u201cHe is an amazing traveler, but this is his first time experiencing jet lag, so he\u2019s been up \u2019til midnight, 1 a.m.,\u201d she shared.<\/p>\n Paris announced she and the venture capitalist, 42, welcomed baby No. 1<\/a> via surrogate on January 24. The exciting news not only came as a shock to the Cooking With Paris<\/em> star\u2019s fans, but also to her family.<\/p>\n The reality star also shared that her journey to motherhood will be featured in the upcoming season of Paris in Love<\/em>, including the moment her mom, Kathy Hilton<\/strong><\/a>, found out she gained another grandchild.<\/p>\n \u201cNobody knew about Phoenix besides Carter and I. None of my friends<\/a>, none of my family, no one knew,\u201d she explained. \u201cI came in and I had Phoenix under a blanket. I said, \u2018I have two surprises for you.\u2019 The first I gave her a baby blue Chanel bag because, you know, who could be mad after getting Chanel? And then I said, \u2018Here\u2019s the second surprise.\u2019 And the blanket came down.\u201d<\/p>\n While fans have to wait to see the sweet onscreen introduction between Phoenix and Kathy, 64, the former Real Housewives of Beverly Hills<\/em><\/a> star shared that she was \u201cover the moon\u201d after first meeting him<\/a>.<\/p>\n \u201cParis and Carter, we know you are going to be the most amazing parents,\u201d she said in a statement to People<\/em><\/a> on January 27. \u201cWe are so thrilled for you both! Thank you for this perfect addition to our ever-growing, beautiful family.\u201d<\/p>\n