Show' host, who started his Monday broadcast addressing his ‘Late Show’ counterpart’s cancellation, also posted on social media last week about the news.

Show” host Jimmy Fallon will cross the street from his NBC headquarters to offer support for CBS rival Stephen Colbert on Monday, The Post has learned. Fallon and a handful of other top comedians are expected to make a cameo at the Ed Sullivan Theater in Manhattan to speak out against the cancellation of Colbert’s top-rated late-night talk show,