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Actors Sacha Baron-Cohen and Isla Fisher arrive for the world premiere of "Les Miserables" in London December 5, 2012. Reuters/Suzanne Plunkett

Isla Fisher and Sacha Baron Cohen have named their first born son Montgomery Moses Brian Baron Cohen. The couple, who are infamously keen on keeping their personal lives private, has confirmed that they have welcomed their third child last month, but the baby details have not been revealed until recently.

TMZ has obtained a copy of the baby’s birth certificate Thursday, which confirmed that the star couple had their first son together on March 17, joining sisters Olive, 7 and Elula, 4 in the family fold. The baby was reportedly named after Isla’s father Brian. The certificate was filed with the Los Angeles County Department of Public Health.

News of Isla’s third pregnancy first broke back in October last year and she has been seen since then with her growing baby bump, including a family vacation in Hawaii in January and an appearance at the Vanity Fair Oscars party. Cohen and Fisher had not made the birth of their first son known until Isla stepped out in public last week without her baby bump.

A source has recently told Mirror that the latest pregnancy was the 39-year-old actress’ “toughest yet” and that Isla was exhausted all throughout the months following her third child’s conception. “Sacha helps, but she's been finding this pregnancy her toughest yet because her daughters are so active,” the insider said. Isla was also reportedly convinced that her having less morning sickness than her previous pregnancies was a sign that she would be expecting a boy this time around.

The “Confessions of a Shopaholic” star is also likely to breastfeed her new baby, having previously revealed in 2013 that she loved how it had created a special “one-on-one” bond between her and her daughters. “The serotonin that's released calms you down and connects you to the baby,” she said, as quoted by E! News. She also said that she was contented with working on supporting roles as of the moment because her family is her “100 percent her top priority.”

Cohen and Fisher is known to have made a habit of keeping their private lives in the down low. The star couple was quietly married in Paris back in 2005, and have gone through major life events without cameras flashing in their direction. They have previously let Isla’s baby bumps confirm her pregnancies with her two other daughters and then her bumpless figure would reveal that she had already given birth.

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