If I remember correctly, Queen Latifah mentions in the bar that she can't get Zeb Zoober to stop calling her "Cha-Cha".
Also, during the closing credits documentary footage, she's wearing the same outfit she had on during the movie.
Therefore, I think she was actually playing herself both times, and they just chose to call her "Cha-Cha" as sort of a joke in the closing credits.