From the Fisher Price Circus 1st Birthday Party Supply Collection. Fisher Price Circus 1st Birthday Invitations. Come one, come all! Start your little ones special day off right with these fun and colorful invitations which feature a classic red and white circus tent with a friendly tiger wearing a number 1 top hat! Each invitation reads "I'M ONE!" in bright multi colored letters and is sure to set an exciting mood for what is to come! Each package contains 8 invitations and 8 coordinating envelopes.