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Bruno Mars hit a milestone Wednesday when his latest album "Unorthodox Jukebox" became his first album to hit No. 1 on the Billboard 200 chart.

Billboard reports that 64,000 units of the album, which contains the hit "Locked Out of Heaven", were digital downloads after a one-day sale of $1.99 on Amazon.com's MP3 site.

Atoms For Peace, formed by Radiohead lead singer Thom Yorke, saw their debut album "Amok" entering the chart in second place, with 50,000 units sold, with last week's No. 1, Mumford & Sons Grammy-winning "Babel", coming in third..