Where has all Zoe Saldana’s muscle gone?

The actress got into serious kick-ass shape for her starring role in last year’s action movie Colombiana but now she looks like she is wasting away, and her dramatic weight loss could be affecting her health, RadarOnline.com can exclusively reveal.

“She looks thin and weak, and incredibly depleted,” nutritionist Majid Ali, who has not treated the star, told RadarOnline.com in an exclusive interview.

A leading nutritionist has warned that Rosie Huntington-Whiteley has lost too much weight and believes she is now barely 100 lbs.

The 24-year-old model turned actress was pictured lounging poolside with boyfriend Jason Statham in Miami recently wearing a floral bikini that revealed her concave stomach and protruding rib bones.

PHOTOS: Rosie Huntington-Whiteley Is Looking Scary Skinny