The 26-year-old singer sat in the control room and fed lines into the pop star’s ear while she interviewed three potential bodyguards.
Joe actually has a connection Britney – he once opened for her on her Femme Fatale tour!
“It’s always a good time hanging out with @ActuallyNPH… but tonight we’re having the @BestTimeEver!!” Britney tweeted before the show aired.
Best Time Ever with Neil Patrick Harris – Voices in Your Head