"I thought I was okay to drive . . . I shouldnt' have put myself in that position."
Flavall said she'd had a "couple and a half" of drinks but thought it wasn't too much and that she'd eaten enough to not be over the limit.
She said police told her she was one eighth over the higher limit.
The young brunette vied unsuccessfully for the affection of bachelor Jordan Mauger in the hit TV3 show's second series.
Flavall - who now works for a talent agency - had a message for other people who might think they were okay to drive after two or three drinks.
"It's not worth it. The least of the worries is actually getting a fine and getting caught. Just imagine what else you could do . . . It's there for a reason."
Flavall was the funny girl of season two. She accompanied eventual winner Fleur Verhoeven on a cruise around the Pacific last year and auctioned off the necklace Mauger gifted her on the show for charity.