 The following year , Stone starred in the comedy The Rocker ( 2008 ) playing Amelia Stone , the " straight face " bass guitarist in a band ; she learned to play the bass for the role . Stone , who has described herself as " a big smiler and laugher " , admitted that she found it difficult portraying a character whose personality traits were so different from her own . The film , and her performance , received negative reviews from critics and was a commercial failure . However , her next release , the romantic comedy The House Bunny , performed better at the box @-@ office , becoming a moderate commercial success . The film saw her play the president of a sorority , and perform a cover version of the Waitresses ' 1982 song " I Know What Boys Like " . Reviews for the film were generally negative , though she was praised for her supporting role . TV Guide 's Ken Fox commented on her performance : " She 's positively incandescent , lighting up a movie that would be pretty dim without her . " That year , she also expressed a desire to become a film producer . 
