The Princess and the Frog starts up with Tiana and her family, when she was younger, talking and cooking in the kitchen together. Tiana's father always dreamed of having a business, however he was poor.
Years later, Tiana's father died, which caused her to work harder in order to achieve her father's dream to start a business. She works at a diner at New Orleans.
Charlotte, Tiana's best friend, invited her to a costume party. Tiana came to the party, but planned to leave. As she was leaving she saw a talking frog. The frog told Tiana to kiss her to break a spell because he was a prince.
Tiana turned into a frog! The frog and Tiana went on wild adventures, however Tiana had to make a choice: give the amulet to the villain or break it so the prince's soul isn't locked away from ever.
Tiana broke the amulet. The prince and Tiana both ran into Charlotte. The prince said he must kiss a princess in order to break the spell. Unfortunately, it was past midnight, so when the prince kissed Charlotte, it didn't work.
In the end, Tiana and the prince, who's name was Naveen, got married. As they kissed, they turned back into humans.