Underwood wore an eye-catching engagement ring as she sat in Ottawa owner Eugene Melnyk's luxury box while watching Fisher and the Senators play Monday night.
The 29-year-old Fisher told reporters "it's an exciting time" before the game with the Boston Bruins and the engagement got plenty of attention.
No wedding date has been set for the couple, who have been dating for about a year.
"The couple couldn't be happier," Underwood publicist Jessie Schmidt said.
Asked by The Associated Press last month what Underwood's family thought of Fisher, the 26-year-old singer said they were supportive.
"They love me and I would hope my parents would think we raised a good, smart girl, so she's going to do the right thing no matter what it is," she said.
Days before the CMA Awards in early November, Underwood did not know whether she would be spending the holidays with Fisher.
"Christmas, I don't know. We haven't really thought that far ahead. We kind of take it one week at a time," she said then.
Underwood has kept her relationship largely under wraps, but she gave Fisher a very public shout-out in the liner notes of her current album, "Play On," that was released Nov. 3. She wrote, "Thank you (No.) 12 (referring to his jersey number.) You are the most amazing addition to my life! You are such a wonderful person and have had such an amazing hand in the building of this album and in the growth of me as a person. I love you so much! You make my life better in every way!"
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On the Net:
Underwood aims for family fun with variety show
Dec 5, 2009 11:00 am PST
The variety show was once a television staple, and Carrie Underwood thinks it might be time for a resurgence. The country music star hosts Monday's "An All-Star Holiday Special" on Fox, and believes it's just the tonic for the regular TV ...
Underwood says "Idol" winners should play to fans
Nov 16, 2009 6:00 pm PST
Since winning "American Idol" in 2005, country singer Carrie Underwood has become one of the show's highest selling graduates, but she warned the latest crop of "Idol" finalists to "stay true" to their fans if they want to find similar...
Music Review: Allen's debut is cool, but average
Nov 16, 2009 11:23 am PST
Kris Allen, "Kris Allen" (Jive Records) On Kris Allen's self-titled debut album, the "American Idol" presents a collection of pop-rock tunes that are cool and simple — a reflection of what we saw from the married 24-year-old on the...
Opry, MySpace team up for Underwood performance
Nov 13, 2009 4:20 am PST
The Grand Ole Opry and MySpace are uniting to live stream an Opry performance with video for the first time this Saturday. Opry performances between 9 p.m. and 10 p.m. EST will be shown, including appearances by Carrie Underwood, Martina...
Music Review: Carrie Underwood shows maturation
Nov 2, 2009 9:00 am PST
Carrie Underwood, "Play On" (19 Recordings/Arista Nashville) Carrie Underwood opens her third album with an audacious stomper, "Cowboy Casanova," a put-down of a playboy that slyly references a famous quarterback Underwood briefly dated. ...