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Rachel Bilson, Breast Pump

Instagram

Rachel Bilson is one happy mom.

The 34-year-old Hart of Dixie and The O.C. alum posted on her Instagram page on Wednesday a photo of herself smiling and holding a breast pump.

"Back to work....." she wrote.

Bilson and partner and Star Wars actor Hayden Christensen, 34, are parents to daughter Briar Rose, who is 13 months old.

The American Academy of Pediatrics (AAP) recommends mothers breastfeed their babies until they are at least 12 months, and thereafter for as long as they want, while the World Health Organization recommends continued breastfeeding infants up to 2 years of age or beyond, according to the Centers for Disease Control and Prevention.

Other celebs who have shared breastfeeding-related pics, including photos actually showing them feeding their babies, include Alyssa Milano, who gave birth to her second child last year has long been an advocate of normalizing public nursing, former Victoria's Secret Angel Doutzen Kroes, who also welcomed her second child last year, Kristin Cavallari, who recently gave birth to her third child and first daughter and Kourtney Kardashian, whose third child Reign will celebrate his first birthday this month.