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She gave birth less than three weeks ago, but she's going all out with the workouts!

After stopping by the gym yesterday, Hilary Duff tweeted, "Big News! I’m working w/ JOHNSON’S Baby on its new charitable program, JOHNSON’S Baby CARES - I love being a mom :)"

JOHNSON’S Baby CARES supports maternal and baby health and Hil will join the effort as the organization launches their campaign supporting Save the Children. Good to see her using her fame for a good cause!