The Victoria's Secret model seemed to have lost her famous curves as she stepped out in a tiny blue and white bikini at a Miami hotel.
She was enjoying a romantic holiday with 44-year-old boyfriend Jason Statham, who was on a break from filming Parker with Jennifer Lopez.
And, on the day that most of us are wondering how to shed the pounds we gained at Christmas, her skimpy swimsuit showed her figure was even more slender than usual.
The British-born model, 24, began dating action man Jason in April 2010 and she recently bought an apartment in New York to share with him.
With Jason filming The Expendables 2 in Bulgaria and China, as well as Parker, they've struggled to spend time together in recent months.
And they have been making up for lost time by kissing and cuddling round the pool at the swanky hotel.
Things are looking Rosie for their relationship in 2012.