NEW YORK -- In just days, Adele's "25" has officially set a first-week sales record, moving 2.433 million albums since its release Friday.

On Tuesday, Nielsen Music said in four days, the British singer broke the record set by 'NSYNC in 2000. The boy band's "No Strings Attached" sold 2.416 million albums in its first week.

"There isn't anybody that I've talked to in the music business who hasn't been astonished by these numbers," said Dave Bakula, senior vice president for industry insights at Nielsen Music.

Adele's last album, 2011's "21," sold more than 11 million units in the United States.

She performed the first single "Hello" on "Saturday Night Live" last weekend. That track alone has sold 2.5 million copies in the four weeks it has been on the market.

Adele taped a concert special at New York's Radio City Music Hall last week scheduled to air at 9 p.m. Dec. 14.