 In early performances of the show , Stefani 's next song was " Hollaback Girl " , the album 's third and best @-@ selling single , performed in a drumming costume and singing with the audience . This was followed by an encore of " Serious " and " Bubble Pop Electric " , for which Stefani was brought out in a stretcher by the Harajuku Girls . However , in later performances , " Hollaback Girl " was saved for the encore and preceded by the two other songs . 
 In early performances of the show , Stefani <a href='null_genetive' title='1'><mark>'s</mark></a>next song was " Hollaback Girl " , the album <a href='null_genetive' title='2'><mark>'s</mark></a>third and best @-@ selling single , performed in a drumming costume and singing with the audience . This was followed by an encore of " Serious " and " Bubble Pop Electric " , for which Stefani was brought out in a stretcher by the Harajuku Girls . However , in later performances , " Hollaback Girl " was saved for the encore and preceded by the two other songs . 
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