Jennifer Lopez Gave Us a Preview of What's to Come at Her Las Vegas Show

When Jennifer Lopez announced she is headed to Las Vegas next year, we knew only to expect the most dance-filled, energetic show ever — but after she gave us a little preview of what's to come on The Ellen DeGeneres Show, we can barely contain ourselves. J Lo performed a Vegas-inspired medley of her greatest hits, including "Jenny From the Block," "On the Floor," and "Get Right." Watch the amazing performance, above, then watch her sing "Back It Up" at the American Idol season finale.