"Happy Mothers Day from little W and me!" the 26-year-old captioned a photo of herself cradling her newborn baby.
She’s yet to announce the baby’s sex, full name and date of birth.
Back in March, Serratos' rep confirmed to E! News that the actress and Boyd, the lead singer of the rock band New Politics, were expecting their first born.
The new parents have been dating for three years.
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