Darren Criss has become a father for the second time.

The former 'Glee' actor and his wife Mia Swier welcomed son Brother Laszlo into the world on Monday (03.06.24), a sibling for their two-year-old daughter Bluesy Belle.

Darren shared a photo of the little boy wearing huge sunglasses, which were seemingly held over his face by Bluesy, and swaddled in an R2-D2 print blanket on Instagram.

He captioned the post: "M + D just delivered their follow-up single.

"[star emoji] Brother László Criss [star emoji] 6/3/24 [music notes emoji] Out now. [music notes emoji] (sic)"

The caption appeared to reference the announcement the 'American Crime Story' star made when Bluesy was born.

Releasing a family photo, he wrote: " M+ D made some sweet music. Bluesy Belle Crisss , 4/11/22 Out now." He emblazoned the post with heart and music emojis.

Darren revealed in December that he and Mia had a new baby "coming soon".

At the time, the actor shared an edited version of the 'Mama Mia: Here We Go Again' promotional poster, which featured him sticking his tongue out over Meryl Streep's face, smiling Mia's head on Amanda Seyfried's body, and Bluesy's face on Lily James' head.

His Instagram post also included a photo of two positive pregnancy tests and he captioned it: “And COMING SOON…let’s hope the sequel is better than the photoshop. (sic)"

The 37-year-old star - who married Mia in 2019 - previously admitted his life was "chaos" as he sought to juggle parenting his young daughter with starring in 'American Buffalo' on Broadway and other work commitments.

He told People magazine at the time: "It's a blessing to get all these things happening kind of all at once - personal, home stuff happening among the same fun, prosperity and excitement that is existing in my professional life - there's something that's very invigorating about that. So I'm rockin' and rollin'.

"Chaos begets chaos,. And I, for better or worse, tend to thrive on a bit of chaos."

Darren previously shared news of Bluesy's birth on Instagram.