Length of feud: 10 years
Making their way in Hollywood as aspiring actors in the 1980s, the Robertses were a tight-knit pair, but a 2001 article in Britain's The Independent newspaper revealed that the two had not spoken in 10 years. "We're brother and sister and we both have really strong opinions about things, so it's a lot of 'f– you,' 'no, f– you' and hanging up the phone. But it got so blown out of proportion," Eric told The Daily Beast in 2010. "We stopped talking and then with the birth of [her twins Hazel and Phinnaeus in 2004] we started talking again."