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Seth MacFarlane and Emilia Clarke of 'Game of Thrones' split up( Left: Jason Merritt / Getty Images; Right: Al Seib / Los Angeles Times )
Seth MacFarlane and Emilia Clarke have reportedly ended their relationship.
Distance is to blame for the split between the Oscar host, 39, and the "Game of Thrones" actress, 25.
"They are no longer dating. It was really a location challenge," a source tells Perez Hilton and E! News. "She has been in Europe shooting 'Game of Thrones,' and he is based in California, so it was hard to make it work despite the distance. They have remained friends."
Full story: Seth MacFarlane and Emilia Clarke of 'Game of Thrones' split up | PHOTOS: Celebrity splits of 2013