Castle and Beckett look on as Carly Rae Jepsen sings on stage in "Dead From New York"

Turns out that Detective Kate Beckett has a fan on the staff of "Saturday Night Tonight"

Who's on top? Castle star Nathan Fillion or pop music star Carly Rae Jepsen while filming Castle Season 7 Episode 22?

But if everything is going so well and everyone is having a wonderful time, then why does Rick look worried?

Alexis and Rick look so content. It's wonderful to see one of our favorite father / daughter duos doing so well after then hit a bit of a rough patch. We guess solving murders is something that helps keep this family together.