Jennifer Lopez and her boy-toy backup dancer Casper Smart heated up the opening of British hospitality mogul Robert Earl’s LA restaurant Planet Dailies & Mixology 101 at The Grove’s Farmers Market Thursday. At the star-studded opening, J.Lo showed off her new video, “Dance Again,” which features rapper Pitbull and Smart. The clip first debuted on “American Idol” earlier that night. “Extra” host Mario Lopez introduced the video, and when it popped on a number of screens, Lopez jumped out of the booth where she was seated with Smart and manager Benny Medina, and stood front and center at the bar watching herself. Lithe Lopez then grooved along to the sultry moves in her video, and when Smart appeared on-screen, she turned and “grabbed his arm with excitement,” a spy said. Lopez and Smart were affectionate all night, while guests included Arnold Schwarzenegger, Alex Pettyfer, Joe Manganiello, Tommy Hilfiger and Piers Morgan.