Kirstie Alley kept her promise and showed up on Oprah today to model in her bikini. She's been working out by walking an hour a day and doing additional pilates exercises on some afternoons. She has some Jenny Craig commercials to shoot later this month so she wants to be in top form. She looks incredibly good for her 55 years but she may have actually gained a bit of weight since she was last on Oprah to make her bikini pledge.

See more before and after pics of Kirstie here.