Jennifer Lopez is truly ageless! On Thursday, May 2, the 54-year-old actress shared a stunning mirror selfie as she posed in a crop top and sweatpants. The pop star’s toned tummy was on full display while she rocked a messy bun and big hoop earrings. In response to the sultry image of the mother-of-two, fans gushed over how good the celeb looked. “LETS GO 🔥🔥🔥,” one supporter raved, while another added, “So casual yet so stylish gorgeous and 🔥🔥🔥.” “STILL DA ORIGINAL GLOW QUEEN 👸❤️❤️🙌,” a third person wrote, while one more joked, “JUSST NOTHING AN OLD GRANNY TRYING TO POST AND BEHAVING LIKE A TE…