LOS ANGELES, Sept 25 — Leighton Meester and Adam Brody are now the proud parents of a newborn baby girl.

According to reports, Meester, 29, and Brody, 35, secretly welcomed their baby girl in a hospital that wasn’t the usual celeb-favoured Cedars-Sinai Medical Centre. The actress is believed to have given birth to the little one on August 4.

TMZ obtained the child’s birth certificate, revealing that the stars named her Arlo Day.

Although the couple kept the pregnancy hidden, the news broke on May 18 when pictures surface of the pair out for lunch in Los Angeles and Leighton was clearly showing off what looked like a baby bump.

Meester and Brody met on the set of “The Oranges” in 2011 and reports of their engagement began circulating in 2013. The former “O.C.” star finally confirmed last February that he and the “Gossip Girl” actress were married.