Celebrity trainer Tracy Anderson recently offered Hello! Online exclusive tips on how to balance an excercise regime with family commitments.
Now, that advice is going to be more relevant than ever for the petite powerhouse, who has just given birth to her second child.
On Wednesday, she and husband Matt Mogol welcomed a healthy little girl, whom they named Penelope.
Tracy already has a 13-year-old son, Sam, with former baseball player, Eric Anderson, and the teenager will now find himself in the role of protective big brother.
After making her name sculpting the bodies of stars such as Jennifer Lopez and Madonna, the former dancer is now a fitness icon with her own empire.
Her regime, The Tracy Anderson Method, has successfully translated from Hollywood into homes around the globe.
Many celebrity mums have extolled the virtues of working with her.
One of her most avid fans, Gwyneth Paltrow, credited her trainer with allowing her to "do ridiculous things like be a 37-year-old mother of two and wear shorts".
Gwyneth was joined by a host of other A-list ladies including J-Lo and Nicole Richie when they threw Tracy a baby shower back in March.
It's a little princess!