Despite the presence of Preston Sturges in the team that crafted its screenplay, the stars are the real reason to watch Thirty Day Princess. Not that Sturges and company have provided a bad screenplay, merely one whose plot is both worn and contrived. It takes some truly silver-tongued dialogue, whip-smart repartee and original characters to make a plot like this crackle, and while the writers have provided sufficient laughs, they haven't hit the desired mark throughout. Fortunately, Princess has the delightful and delectable Sylvia Sidney getting play a dual role that always her to be both commoner and royalty, and Sidney sails through the part with charm and graciousness. Her frequent co-star Cary Grant is on hand once again, still not quite formed into the persona that would eventually become one of the screen's immortals, but more than enough fun to make it worth spending time with him. There's also Edward Arnold making trouble as only he can, as well as a scene stealing performance from Vince Barnett. Marion Gering's direction is efficient, and cinematographer Leon Shamroy has a few shots that remind us that he's a lens-man of distinction. All in all, a trifle, but a harmless and pretty fun one.