British singer Adele's new album "25" has sold a record 2.3 million copies in the United States in the first three days of its release, Nielsen Music said on Monday.The monster sales for the first three days mean Adele will break the first week sales record currently held by boy band NSync's 2000 album "No Strings Attached," which opened with 2.4 million copies.The 27-old singer's previous album "21" released in 2011 has sold more than 30 million copies worldwide.Adele earlier decided not to release her album on most major online music platforms.