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"It pains me to report that on the first day of the shoot, Britney knew her lines better than I knew mine," actor Josh Radnor tells PEOPLE exclusively. "She's been great to work with."
In the episode, which will air March 24, Spears plays a receptionist at a dermatologist's office, who falls for one of the show's main characters, Ted, played by Radnor. She is expected back on set tomorrow for a second day of shooting.
Spears first met the cast on Monday during a table read. A set source told PEOPLE, "She was a bit nervous, but didn't let it get to her... She really seemed to enjoy herself and feel comfortable."
