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Lady Gaga's "ARTPOP Ball" tour is expanding.  The pop star has added six additional stops to her upcoming North American trek, putting an end to rumors that she was having trouble selling tickets. 

A post on her Little Monsters site says "due to an overwhelming demand," she's tacking on a second night at the Staples Center in Los Angles on July 22nd.  Other major venues have been added to the tour as well, including the US Airways Center in Phoenix, the MGM Grand in Las Vegas, and Pepsi Center in Denver.  She'll also make stops in Stateline, Nevada and Salt Lake City.  Pre-sale ticket for Gaga's blog followers will go on sale, starting Monday, March 24th.  

The star has also unveiled one of her opening acts, a K-pop sensation called Crayon Pop.  The girl group will join her on the dates in June and July.  "ARTPOP Ball" starts on May 4th. 

July 22 - Staples Center - Los Angeles, CA 
July 30 - US Airways Center - Phoenix, AZ 
Aug 1 - MGM Grand Garden Arena - Las Vegas, NV 
Aug 2 - Harveys Lake Tahoe - Stateline, NV 
Aug 4 - Energy Solutions Arena - Salt Lake City, UT 
Aug 6 - Pepsi Center - Denver, CO 

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