TV Article Kaley Cuoco and Johnny Galecki shut down dating rumors 'Big Bang Theory' costars: 'No home wreckers or secret flings going on here' By Mary Sollosi Mary Sollosi Mary is EW.com's assistant features editor. She writes about movies, books, fashion, and the Real Housewives. EW's editorial guidelines Published on October 15, 2015 12:00PM EDT Photo: Sonja Flemming/Getty Images Kaley Cuoco and tennis player Ryan Sweeting announced their split after 21 months of marriage in September, but that doesn’t mean that she’s getting back together with her Big Bang Theory costar Johnny Galecki. Amid rumors that Cuoco and Galecki have rekindled their romance since she and Sweeting broke up, the actors both took to Instagram to set the record straight. Reel-to-real couples: 13 relationships that blossomed on-screen and off “So sorry to disappoint, but no home wreckers or secret flings going on here,” Cuoco captioned her black-and-white fist-bumping pic. “Me and @sanctionedjohnnygalecki are just the best of buds — Leonard and Penny will just have to suffice!” Galecki posted another image, taken at the same time, with the caption, “No scandals / home wreckers / pregnancies here, y’all. Just profound friendship.” The non-home-wrecking pals, whose characters recently tied the knot on The Big Bang Theory, dated secretly for about two years early in the series’ run.