Carey Mulligan confirms secret arrival of third child with musician Marcus Mumford

Congratulations are in order for musician Marcus Mumford, 36, and Carey Mulligan, 38, who have welcomed their third baby together.

Speaking with Vogue for the publication's November cover, Mulligan confirmed she had quietly given birth to the couple's third child earlier this year.

Vogue confirmed the actress had recently welcomed her third child, though the name or sex of the baby was not disclosed.

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According to the outlet, Mulligan began the interview with a yellow diaper-leak stain on her shirt while holding her bub in her arms.

"Here I am, ready for Vogue," she apparently joked at her entrance.

"I'm going to change you, and then we're going to find Mum another shirt…." actress then said to her child.

The outlet confirmed that Mulligan was around six weeks postpartum at the time of the interview conducted in London, which was published overnight.

The actress first dropped the news that the couple were expecting earlier this year in January.

There were speculations that Mulligan had already given birth after she appeared at the Vogue World event on September 15 in a tight black gown, and not a bump in sight.

The English actress has been married to Mumford since 2012, and already shares daughter Evelyn Grace, seven, and son Wilfred, five, with the musician.

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The couple reportedly met as children at a summer camp, becoming pen pals before later starting a romantic relationship in 2011 following Mulligan's split from Shia LaBeouf.

Just five months later, after they first sparked relationship rumours, the couple announced they were engaged in August 2011, tying the knot the next year in April.

The pair currently live in Devon, just outside of London with their now three children.

The Promising Young Woman star opened up to Vogue in the same cover issue interview about her home life with the Mumford & Sons musician, and raising their three children in the English countryside.

"It's very normal," she shared, detailing they do the average "school runs" and "Sunday lunches" like any other family.

Mulligan's next appearance on the big screen is in the film Maestro alongside Bradley Cooper, which is set to be released on November 22 this year.