"I remember I was at dinner with John Stamos ... and I was like, 'Oh, maybe this is a date!' ... but I blew it," she recalled with a laugh. "I remember thinking, like, 'Oh s***, if this is really a date, I think I was wearing a Leslie Knope shirt -- I think a shirt from [the set of "Parks and Recreation."] I wasn't foxy."
Now, she's happily dating comedian Nick Kroll, with whom she said she'd been friendly for years prior. Arnett, she said, has also met him.
"They know each other!" she said. "It's all fine."