Michael Jackson's youngest son, Blanket (born Prince Michael Jackson II), turned 15 years old on Tuesday, and his sister, Paris, shared a heartfelt message for him via Instagram. The 18-year-old posted a throwback photo of the two [2], writing, "Ughhhhhh my little man is 15 today. slow the f*ck down, i want you to stay a baby forever ðŸ˜ðŸ˜ðŸ˜ this lil dude right here is one of the most strong, intelligent, and determined people i know. watching you grow up and slowly become a man is like super terrifying but i honestly can't tell you how proud i am. i love you so much B." Paris clearly has a lot to celebrate lately. Just last week, Paris posted a childhood photo of her and older brother Prince Michael [3] in honor of his 20th birthday.