Jason Sudeikis shows off newborn baby Otis Alexander to co-star Dianna Agron Credit: Patriot Pics/FAMEFLYNET PICTURES

One proud papa! Jason Sudeikis is already showing off his baby boy, Otis Alexander, just days after his fiancée Olivia Wilde gave birth.  

The happy couple welcomed their first child into the world on Easter Sunday, April 20, and Sudeikis couldn't be more excited to share his bundle of joy with friends.

The 38-year-old actor returned to the set of his new movie Tumbledown on April 24, in Boston, Massachusetts, and was caught presumably sharing snaps of baby Otis to co-star Dianna Agron

The We're The Millers actor was beaming as he scrolled through pics on his iPhone in between takes; the look on Agron's face proves baby Otis is (of course!) adorable!

New mom Wilde herself shared a snap of her newborn the day before on April 23. The 30-year-old took to Twitter, sharing a sweet pic of her cradling her baby with the caption:  "Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I'm the building)."

The Drinking Buddies actress jokingly added: "Having an infant son alerts me to the fact that every man, at one point, has peed on his own face. #awesome."

Prior to giving birth, Wilde kept up the good spirits, even dancing the night away in New York City just hours before delivering the baby!