Is new mom Adriana Lima preparing for battle? Close to it - the Victoria's Secret Fashion Show is just two months away and the 31-year-old gave birth to her daughter Sienna on Sept. 12.

Instead of stressing about slimming down, Lima took action and did an intense workout in Miami Beach.

The super model tweeted, "Just finish workout ;) " along with a sweaty and makeup-free picture of herself.

About a month ago, Lima gave a statement to Us Weekly regarding her and former NBA star husband Marko Jaric's newborn.

"Marko and I are overjoyed to welcome Sienna into our family, and Valentina is looking forward to becoming a big sister. The couple's second daughter was born at 1 p.m. and at the time weighed approximately 7 pounds.

Although Lima has a passion for modeling, her most important job is being a mom.

"My favorite job in the world is being a mom! My family could not be more happy," the model tweeted when she confirmed Sienna was due in March.

The couple, who wed in February 2009, had their eldest daughter, Valentina, that same year.

"Every day I discover something about her," she told Us Weekly about Valentina, 2. "Every single day is a pleasure to see her. I'm always rushing home! I never rushed to go back in my life! It's the best."

Her life as a model seems spontaneous, but she told Us Weekly her most unexpected moments come from Valentina.

"She knows already how to count to five. And she knows colors, like red, pink, white -- it's so cute! Everyday it's something new."

Tags: Adriana Lima