LOS ANGELES (Hollywood Reporter) - What Queen Latifah does in Vegas, stays in Vegas -- at least for now.

The actress-rapper-singer will make a cameo appearance in the Fox romantic comedy feature "What Happens in Vegas ... ," starring Ashton Kutcher and Cameron Diaz. What that cameo will be, however, is being kept under wraps.

Kutcher and Diaz play two people who discover after a night of debauchery in Vegas that they've gotten married, with one of them hitting a jackpot after playing the other's quarter.

Latifah, who was nominated for an Oscar for her supporting role in "Chicago," is on tour to promote her latest album, "Trav'lin' Light," which debuted at No. 11 on the Billboard 200 last month.

In January, she stars opposite Diane Keaton and Katie Holmes in Overture Films' "Mad Money," about three women who strike up an unlikely friendship while working at the Federal Reserve and concoct a plan to rob the bank.