Christina Aguilera reportedly fluffed a line of the American national anthem at the start of last night's Super Bowl.
The singer was supposed to sing the Star Spangled Banner line "O'er the ramparts we watched, were so gallantly streaming", but instead she shocked audiences by repeating an earlier line, with a slight variation.
She sang: "What so proudly we watched at the twilight's last gleaming" - the same line from earlier in the song but with the word "watched" instead of "hailed".
The cameras quickly noted the shock on faces on and off the football field but the mistake also sparked a host of comments on social network sites.
A number of celebrities streamed into the Cowboys Stadium in Dallas, Texas, to watch the match between the Pittsburgh Steelers and the Green Bay Packers.
Hugh Jackman, John Travolta, Adam Sandler, Jennifer Aniston, Catherine Zeta-Jones and husband Michael Douglas were among the famous-name spectators.
Owen Wilson and Jamie Foxx, who both grew up in North Texas, were also there.
Keith Urban and wife Nicole Kidman's second daughter, five-week-old Faith, joined her two-year-old sister, Sunday, at the stadium, where singer Urban and Maroon 5 gave a pre-game concert.
Urban said: "It's just wonderful to have another girl in the house."
