PHOTO GALLERY: Happy birthday, Dr. Seuss!

Michael Cole, Addison Weimann and Vedant Singh like wearing the hats they created.

Dahlia Olvera reads Dr. Seuss to her classroom of 3 year olds.

Sloan Mondor, 2, works on his hat.

Caden Zabawski, 3, wears a real Dr. Seuss hat while listening to a story.

Alexandra Mahiquez, 2, looks adorable in her outfit.

Madison Rupert glues hands onto her hat creation.

Veronica Densmore reads a Dr. Seuss book to her classmates.

Preschool Assistant Director Christina Robertson dresses her 5-month-old daughter, Harper, for the celebration.

Madison Dworet, 4, wears the costume her mom made for the occasion.

Namita Kondabala enjoys being Thing 1.

Khendal Clark colors in her Dr. Seuss attire.

Alexis Simone, 3, gets her hands painted by teacher Jessica Gant, as part of hat-making festivities.