Kaley Cuoco – Thad Luckinbill: Dated (2002)
There seems like there was a time once when it was cool to have the same colored hair as your significant other. It looks like Kaley Cuoco and Thad Luckinbill caught on to the trend at the time. The two dated for just under a year back in the early 2000s. At the time, Thad was famous for playing J.T. on The Young and The Restless. He was one of the long-standing cast members. He played on the show from 1999 to 2010.
DJ Qualls – Nikki Reed: Dated (2006 to 2007)
Toby Loobenfeld, the CalTech research assistant on The Big Bang Theory is played by DJ Qualls. The actor made several appearances on the show. Whenever Sheldon needed Toby, he would play Sheldon’s fake cousin. However, DJ Qualls is more famous for playing Kyle in the Road Trip movies. He’s previously dated fellow actress, Nikki Reed. She’s best known for her role as Rosalie Hale in the Twilight franchise. The two dated for just over a year.