Neil Patrick Harris to Appear on "Big Brother"
Tuesday night's episode of "Big Brother: All-Stars" will feature a guest appearance by Neil Patrick Harris.
Harris, an avid reality TV fan and star of the CBS comedy "How I Met Your Mother," drops by the house for "Christmas in August," a prize the Houseguests won in Sunday's food competition.
"Big Brother: All-Stars" airs Tuesday night at 8PM ET/PT on CBS.