HOLLYWOOD, Calif. — Katy Perry is shooting down circulating reports that she's pregnant.

In a message posted Wednesday to her Twitter page, the 25-year-old pop star said she was feeling a bit emotional due to her "period."

"Better luck next month peepz," wrote Perry in reference to the tabloid chatter.

The pregnancy rumors kicked up a notch over the weekend when Perry and her fiancé, Russell Brand, were photographed at a North London baby boutique.

Perry, 25, and Brand, 34, got engaged over the New Year's holiday after four months of dating.

Also see: Katy Perry Pictures