Poured into a retro-style postbox red bikini, the Kent-born model is strikingly reminiscent of screen siren Rita Hayworth.

The curvaceous star with her tumbling brunette curls, and heavily lashed eyes looks every inch the 40s pin-up. And one onlooker told The Mirror: Kelly oozed golden-page glamour.

"She looked really comfortable in her skin - and far sexier than those stick-thin stars we often see posing around Miami.

"Rita Hayworth was known for her sexual charisma - and we could see why Kelly is too."

After leaving behind her barely there frock wearing starlet days. Brook has long been a champion for old-school glamour, which clearly flatters her voluptuous hourglass figure.

The 27-year old wears a swimsuit so well, she now has her own swimwear line for high street fashion chain New Look.

Kelly recently admitted she's aware it's not just her model looks that ensure she has a popular following in the U.S.

Better known there for her role in Superman TV series Smallville she says her large breasts are a novelty in Hollywood, but doesn't mind the attention.

She said: "My breasts are a bit of a novelty in California. And they go mad for my teeth as well."

Unfortunately for the former Big Breakfast presenter, it's not all plain sailing.

The actress' latest film, in which she stars with fiance Billy Zane, received a critical drubbing after premiering at the Cannes Film Festival.