The Girls Aloud beauty is famous herself for having a shapely rear and envious curves but she thinks the 'American Idol' judge has the perfect hour-glass figure.
She said: "It's a really tough call at the moment, but I think Jennifer Lopez is in great shape. She looks fantastic."
Kimberley – who is in a long-term relationship with Justin Scott – is not overly obsessed with her weight but has found a regime that works for her.
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She explained: "I wouldn't necessarily say I'm too obsessive health-wise, but I have been working out for the past year or so. I've realized I can either exercise and eat normally or I can diet and not work out – so I work out. It's more fun and it definitely makes you feel more virtuous."