Tracy Anderson Gives Birth to a Baby Girl!

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Celebrity trainer Tracy Anderson attends the Giving Back Never Looked So Good event hosted by Catt Sadler at W Hollywood Hotel on January 24, 2012 in Hollywood, California. David Livingston/Getty Images

It's a girl for Tracy Anderson!

The celebrity personal trainer and her husband Matt Mogol welcomed baby Penelope into the world on Monday, Us Weekly can confirm exclusively. Penelope, Anderson and Mogol's first child together, joins stepbrother Sam, Anderson's 13-year-old son with her first husband, former NBA star Eric Anderson.

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Back in March, the fitness pro and founder of The Tracy Anderson Method was feted with a baby shower that boasted a celebrity guest list: Catt Sadler, Sally Pressman and Nicole Richie. Absent A-list pals and clients including Gwyneth Paltrow, Jennifer Lopez, Courteney Cox and Jessica and Kate Capshaw sent along items from her registry like a $500 Fresco Bloom high chair and three months' worth of diapers from Jessica Alba's Honest Company.

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"Everything was very girly," a source told Us about the baby bash. "The cake and tablecloths were all pink and green. Each table had Barbie dolls that were custom-made to look like workout Barbies carrying weights. They had Miss Piggys — little toys where you push on the toy and you hear the [Olivia Newton John] song 'Let's Get Physical.'"

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Anderson and Mogol wed in Big Sur, Calif. September 27 of last year.

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