The `On The Floor` hitmaker has been dating the 25-year-old backing dancer for over a year and credits him with supporting her through good times and bad. Jennifer, 43, told the February edition of America`s Harper`s Bazaar: "He`s fantastic; he`s like my best friend. I can tell him everything, when I`m feeling down, when I`m feeling good. He gives moral support, endless love and support." Although Jennifer admitted she isn’t at her best when she is tired, the star - who has four-year-old twins Max and Emme with her former husband Marc Anthony- wouldn`t change her hectic schedule for anything. She said: "The worst is when I`m tired. It`s the overworking, which I`ve learned to say no to. I`m not my best self. I`m at my best, I think, when I`m giving love. I feel my best, I am my best, I need my best. "I`m a singer. I`m a dancer. I`m a performer. I`m an actress. That`s what I`m supposed to be doing. It makes me a better parent, a better person. I think I can just handle more than the average bear, you know? "I make it as simple and as beautiful as I can because my life is kind of big. So I pack my luggage, or dress myself, or comb my kids` hair, pick up their clothes-that makes our life beautiful, you know? There`s something very elegant in that." Jennifer is famous for her fashion choices and revealed she still has the palm-print Versace dress she memorably wore to the 2000 Grammy Awards. She said: "I have that at home. The other day, my housekeeper put it on a mannequin in my spa, where I get my hair and makeup done. She sent me a picture. She was like, `You like this dress?` Um, yeah, but I don`t know if I like it out in the house!"