Bündchen takes baby Benjamin for a hike in L.A. Plus: Nick Jonas, Scarlett Johansson, Channing Tatum and more

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GO FIGURE

Scarlett Johansson flaunts her famous curves in a peplum Armani Privé dress Monday at her Iron Man 2 premiere in L.A. The actress told PEOPLE it took "lots of strength training and lots of pain" to shape up for the action flick.