Scarlett Johansson has become a proud mother of two as she welcomed her first child with husband Colin Jost.

The pair recently welcomed a baby boy as Jost took to social media on Wednesday, August 18, to share the exciting news as he revealed the tot's unique name.

Announcing that their newborn son is named Cosmo, Jost - who married Scarlett in October last year - said the couple love him "very much" and asked for privacy from their fans.

The text post was written in bright blue and green writing on a black background.

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"Ok we had a baby," Colin told his 609,000 Instagram followers in the post.

"His name is Cosmo. We love him very much. Privacy would be greatly appreciated."

Colin captioned the post with the hashtags #wegotawaywithitforalongtime, #nokidspolicy and #we'regoingtodisneyworld.

The comedian, who stars on Saturday Night Live, was instantly showered with words of congratulations by his fans in the comments section.

Johansson is also mother to daughter Rose Dorothy, six, who she shares with French journalist ex-husband Romain Dauriac.

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Rumors of her pregnancy began swirling back in early July, when she missed several events for her Marvel film Black Widow.

Johansson and Jost got married in a low-key ceremony held at her home in New York back in October last year.

Prior to finding love with Jost, the actress was married to Romain from 2014 until 2017, and before that to Ryan Reynolds from 2008 until 2011.

Johansson has recently been making headlines over her decision to sue Disney over the streaming of her latest onscreen venture, Marvel's Black Widow.

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The actress accused the company of breaching her contract when it offered the film on its streaming service at the same time as it was released in movie theaters.

The film set a box office record for the Covid-19 pandemic, grossing $218 million in its first weekend, however, box office receipts then fell sharply as Johansson argues she was deprived of potential earnings, per BBC.

Johansson's earnings are based partly on the Marvel film's box office takings and, in court papers, she said the movie was intended for initial release exclusively in cinemas, per ET.

It's also reported that Johansson is demanding a jury trial to rule on this case.

Featured image credit: REUTERS / Alamy

Scarlett Johansson's husband reveals she's given birth as he shares son's unique name