FRIDAY 6:30 PM: (No Easter Weekend estimates yet.) Twentieth Century Fox's Rio 3D may be about a bird, but very early numbers show "it's holding like a rock," a studio exec just emailed me. Lionsgate's latest in Tyler Perry's franchise, Madea's Big Happy Family, looks soft. This is, after all, Perry's sixth cross-dressing film; the last one opened to $41M and the one before was $30M.