Say this for Queen Latifah: She does her homework. The day before she taped her appearance on the celebrity version of “Who Wants to Be a Millionaire” last Friday, the talk show star was quizzed on trivia by her show’s researcher and talent booker, says USA Today. The quizmeisters relied on a version of “Millionaire” on the Web. During her lunch break, Latifah even practiced with flash cards. And the result? At the taping, Latifah still needed to enlist the aid of “phone-a-friend” lifeline Joe Trela, who previously won a million from Regis Philbin. (SPOILER’S ALERT: Trela couldn’t answer Latifah’s question.) The celebrity versions of “Millionaire,” which reportedly raised $2 million for charity, will air from May 1 through 4. David Duchovny was said to have done very well. The same was not said about Ray Romano.