A pair of New Zealand comedians who play struggling musicians on a cult hit television show officially graduated to stardom this week when their debut album opened at No. 3 on the U.S. pop chart.

The self-titled album from Flight Of The Conchords, who have their own show on HBO, sold 52,000 copies in the week ended April 27, according to Nielsen SoundScan.

In the process, they outsold pop idol Ashlee Simpson, whose new album opened at No. 4 with 47,000 copies. Bittersweet World marks her first release that did not go to No. 1.

Mariah Carey outpaced everyone with sales of 182,000 copies for her reigning chart-topper E=MC2.