It seems that Carrie Underwood, who shone in her role as Maria von Trapp in last week's TV special, 'The Sound of Music Live!,' is an even bigger star than we initially thought.

The songstress helped carry the three-hour production to the top of the ratings when it aired on Thursday night (Dec. 5) on NBC. But while the initial reports were that the all-star cast, which also included 'True Blood' star Stephen Moyer and TV and Broadway actress Laura Benanti, earned 18.5 million viewers, new reports indicate that number is actually significantly higher.

According to the New York Times, once the number of delayed viewers (who watched at a later date on their DVR) were calculated, that number of viewers ballooned to 21.3 million -- almost three million more than what was initially thought. The additional viewers also earned the show one more point in viewers between ages 18 to 49.

'The Sound of Music Live!' did the best among affluent households, or households making $100,000 a year or more. In those homes, the show earned a 6.8 rating, which is about 45% higher than normal for the network.

As for Underwood, who received mixed reviews for her performance, she couldn't be more pleased with the final result.

"Glory to God tonight...I couldn't be more proud," she tweeted after the show. "What a tough thing to pull off and we did it! I am so blessed!!!"

NBC will re-air 'The Sound of Music Live!' this Saturday night (Dec. 14). The DVD will be available on Tuesday, Dec. 17. The network plans on tackling a different musical next year during the holiday season.