Adele's grip on the Billboard 200 might be slipping a bit. On this week's chart, the British singer's "21" drops out of the top three for the first time since it debuted more than six months ago. Her sophomore effort moved 73-thousand copies this week, which was good enough for a spot at number four.

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Jay-Z and Kanye West's "Watch the Throne" debuted at number one with 436-thousand sold in its first week out. Country star Luke Bryan also scores a big debut with his "Tailgates and Tanlines" coming in at number two ahead of the 39th "Now That's What I Call Music" compilation at number three. Last week, Adele notched a 12th week at number one, setting a record for the most time spent on top of the Billboard 200 since the turn of the millennium.

In the meantime, Adele continues her tour behind "21" with a show in San Diego tonight. This weekend she heads to Las Vegas for a show on Saturday and Salt Lake City for gig on Sunday.

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