"I think it's serious. He's really happy with her," Fisher's friend Tony Greco tells The Ottawa Citizen. "They're a perfect match."
Underwood's previously quiet connection to the 28-year-old athlete was put on public display at an Ottawa hockey game last week, when the Jumbotron "Hug Cam" caught her with her beau's family in a private VIP box.
Of course, both Fisher and the notoriously private Underwood are staying mum on the relationship.
"I can't comment on anything in my personal life, so that's about all I can say. I don't really want to say anything," Fisher told The Ottawa Citizen after a recent practice.
Underwood and Fisher first met backstage at her concert in Ottawa last March.