Pregnant Jessica Simpson's New Goal: "Look Like Jessica Alba After Baby!"

Jessica Simpson might not be ready to give birth just yet, but she is ready to hit the gym! The first-time mom-to-be Tweeted at her mom pal Jessica Alba, letting her know she wants her body after baby! 

OK! GALLERY: JESSICA ALBA HITS UP TOYS R US FOR SOME LAST MINUTE HOLIDAY SHOPPING!"New goal: look like @jessicaalba after baby. Job well done lady!" Jessica S. Tweeted last night. And Jessica A. was overjoyed with gratitude!“@JessicaSimpson: -OMG! Ur so sweet!" Jessica A. Tweeted back at her. "Thx hon!"The mom-of-two, who gave birth to daughter Haven in August, just showed off her killer abs on the beach in Cabo San Lucas on Monday. She credits prenatal yoga and a healthy diet for her post-baby body.OK! NEWS: JESSICA SIMPSON AND ASHLEE SIMPSON LAUNCH TWEEN CLOTHING LINE IN NYCSo Jess, are you eating for two or keeping healthy throughout your pregnancy? If you want to look like Ms. Alba, stick to her mommy routine!