LOS ANGELES (Reuters) - Flamboyant pop star Lady Gaga has scored her first No. 1 album in the United States after a 99-cent promotion by Amazon.com sent the much-hyped release past the rare million-copy mark in its debut week. According to sales data published by Billboard magazine, Born This Way sold 1.11 million copies during the week ended May 29. It marks the biggest first-week sales total since rapper 50 Cents The Massacre debuted to 1.14 million copies in March 2005. The last album to break the million mark was country starlet Taylor Swifts Speak Now, which started with 1.01 million copies last November. In all, just 17 albums have sold more than one million copies in their first week since tracking firm Nielsen SoundScan began collecting point-of-sales data in 1991. Boy band 'N Sync holds the first-week record with 2.4 million copies for its 2000 album No Strings Attached. Billboard estimated that Amazon downloads accounted for upward of 440,000 downloads of Born This Way. Heavy demand crashed Amazons servers when the online retailer launched its one-day-only promotion last Monday. The firm gave fans another chance to get the album for 99 cents on Thursday. Billboard said music industry observers had been expecting the album to sell between 650,000 and 700,000 copies before the Amazon promotion kicked in.