According to various sources, it appears that Leighton and Blake are no longer friends. The two were reportedly seen arguing on the set of their show Gossip Girl back in 2010, and they haven't been spotted together since. It's possible that they've simply grown apart over the years, or that their relationship was never as close as it appeared to be onscreen. Whatever the case may be, it seems that these days, Leighton and Blake are just acquaintances.