The "Call Me Maybe" singer becomes the second act to withdraw from the July concert, citing her belief "in equality for all people."

Carly Rae Jepsen won't be returning any more calls from the Boy Scouts.

Last summer's breakout singing star has canceled her scheduled appearance at the Boy Scouts of America Jamboree in July, citing the organization's controversial ban on gay members.

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"As an artist who believes in equality for all people, I will not be participating in the Boy Scouts of America Jamboree this summer," Jepsen tweeted Tuesday morning. "I always have and will continue to support the LGBT community on a global level and stay informed on the ever changing landscape in the ongoing battle for gay rights in this country and across the globe."

Her about-face comes a day after the band Train pulled out of its scheduled performance for the same reason; a petition on the site Change.org began the pressure on the two acts to remove themselves from the concert roster. GLAAD also supported the petition.

The century-old group has taken heat in recent years for barring openly gay members; in January, word leaked that it was discussing internally a lift of the discriminatory ban, but a vote on the matter was punted to its annual meeting in May.