Not content with just going for a run, the actress went for a jog on her way to ANOTHER workout at the gym in Santa Monica.
Blimey! Jennifer, 41, donned a simple T-shirt and leggings for her run, but managed to look effortlessly cool in her sportswear.
She recently shed a whopping three stone following the birth of her youngest son, Samuel, and for her role in Dallas Buyers Club.
Co-stars Matthew McConaughey and Jared Leto also shed lots of weight for the movie, and Jennifer joked: "All anybody says is, 'All those boys lost 50 pounds.'
"Do you know how much weight I lost before I did this movie? Fifty pounds. Has anyone given me a ticker tape parade? No!"
After her workout, Jennifer then popped in to a nearby supermarket to stock up on some groceries.
As well as lots of healthy fruit and veg, we're pleased to report that the mum-of-three did allow herself a treat, buying some chocolate ice creams.
Well, there's no point in hitting the gym if you can't reward yourself afterwards!
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