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Just two weeks after giving birth to baby Haven, Jessica Alba is back at the gym and already looking great post baby!

The Spy Kids 4 star has been Tweeting about her new workout regimen, recently expressing: "I did my first day of workout since I had the baby, just cardio for 40 mins -it's a start ... My doc told me I could start after 2 weeks. I'm going light, stationary bike and elliptical."

When one of Alba's followers Tweeted a thank you to the star for motivating her to lose her own baby weight, she replied: "let's do it together. I could use the motivation as well."