Kirsten Dunst has sparked speculation she's pregnant, after she was photographed with her on-off beau Jake Gyllenhaal looking at prenatal vitamins.

The Spider-Man beauty, 23, was seen studying a box of New Chapter Organics Perfect Prenatal dietary supplements at Hollywood's Whole Foods market on Saturday (13AUG05).

And, according to In Touch Weekly, Gyllenhaal contributed to the effort by grilling an employee for more information about the product.

According to New Chapter, the vitamins promote physical stamina and emotional well-being while nurturing mother and baby.