Alyson Hannigan Bombshell About 'The Mother' Reveal On 'HIMYM'

Alyson Hannigan is lucky enough to be associated with two huge television properties. Between appearances on "Late Show" and "Watch What Happen: Live" Wednesday night, she managed to talk about both of them. And during her "Late Show" appearance, she dropped a pretty huge hint about the long-awaited "mother" reveal on "How I Met Your Mother."



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