George Soros will be the first to be quizzed by lawyers in his battle with former mistress Adriana Ferreyr, a judge ruled yesterday. The billionaire will be deposed by the end of July. Also to be quizzed is Soros’ new fiancée, Tamiko Bolton, on Sept. 27 — which could interfere with their planned fall wedding. While Soros didn’t attend the Manhattan hearing, Ferreyr sat with her attorney William Beslow and stared down Soros’ counsel Gary Stein. Ferreyr is suing Soros for $50 million, claiming he promised her a $1.9 million apartment but gave it to Bolton. The judge in the case said the doorman would be called: “They know everything . . . For those of us without doormen, we might have a little more privacy.”