Neil Patrick Harris, star of the CBS comedy series HOW I MET YOUR MOTHER and an avid reality TV fan, will make a surprise visit to BIG BROTHER: ALL-STARS when he drops into the house for "Christmas in August," a prize the Houseguests won in Sunday′s food competition.
Harris′ guest appearance will be broadcast Tuesday, Aug. 29 (8:00-9:00 PM, ET) on the CBS Television Network.
