Leighton Meester and Adam Brody have welcomed their first child together. The couple are yet to confirm the arrival of their child but a U.S. entertainment website has obtained the birth certificate.

Leighton MeesterLeighton Meester at the L.A. premiere of Life Partners in November 2014.

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The couple welcomed a daughter, named Arlo Day Brody, on Sunday 4th August. According to the birth certificate obtained by TMZ, Arlo was born at 12:12am in Whittier, California. 

It’s not surprising that Meester and Brody have yet to confirm the arrival of their now six-week-old baby as the couple are notoriously private. They did not confirm their nuptials after they secretly tied the knot in February 2014.

Neither did the couple officially confirm they were expecting a baby. However, paparazzi pictures documented Meester’s growing baby bump throughout the summer months. 

Gossip Girl star Meester and Brody, best known for his role as Seth Cohen in The O.C., met in 2011 on the set of The Oranges in which they co-starred. They began dating the following year and became engaged (although it was never officially announced) in November 2013.

Meester rose to prominence in 2007 when she starred as Blair Waldorf in Gossip Girl. Her on-screen and off-screen friendship with her co-star Blake Lively made her especially popular with fans of the show. Lively gave birth to a daughter in December 2014 with her husband Ryan Reynolds. Fans are now overjoyed at the prospect of mini Meester and Lively’s making friends in the future.

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Adam BrodyAdam Brody at the premiere of DirecTV's comedy Billy & Billie in Los Angeles, February 2015.