United Kingdom, June 4 -- Bethenny Frankel looks like "a train wreck most of the time".

The 54-year-old reality TV star recently wore a thong bikini bottom at the Sports Illustrated Swimsuit Swim Week runway show in Miami, and Bethenny believes there's an unhealthy fascination with her appearance.

In a video posted on Instagram, Bethenny explained: "I guess we have to discuss what I looked like on that runway because the internet is so fascinated with my age, my weight, my face, my hair.

"Listen, I can tell you with great certainty that every woman that was with me on that stage did not look that way two hours prior."

Bethenny insists she's "never been vain" and admitted that she looks very different at home.

She said: "I look like a...