Britney Spears by Jeffrey Mayer/WireImage.com Britney Spears by Jeffrey Mayer/WireImage.com

How goes it three days into Britney's stint on How I Met Your Mother, now slated for a March 24 air date? "[It] has been so terrific," Spears shares. "Everyone, including the cast, the crew and the producers, has been so wonderful."

Spears is guest-starring as the assistant to Ted's dermatologist (Sarah Chalke), and as such will find herself crushing on the young architect as well. "Abby is such a fun girl to play," says Brit. "I'm having a blast!"

Ted's portrayer shrugs off any speculation that the headline staple has been a handful in her most unexpected sitcom stop-by. "She's friendly, shows up on time, knows all her lines, nails all of her jokes," says Josh Radnor. "The only thing 'scandalous' about all of this is how non-scandalous it is." - With reporting by Michelle Heller

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Related:
" Mother Boss: "We Can't Wait for You to Meet Britney!"
" Britney Is Bonkers for How I Met Your Mother's Ted!
" HIMYM/Britney Fallout: Silverstone Out, Chalke In!