The Hollywood baby boom just keeps on going! Check out the latest in celebrity baby news:

Alec Baldwin

His “30 Rock” character Jack Donaghy became a dad in season five of the hit comedy, and now Alec Baldwin is going back on diaper duty in real life.

The 54-year-old actor is expecting a baby with wife Hilaria Baldwin (nee Thomas). “We’re having a baby!” the 28-year-old NYC yoga instructor exclaimed during an interview with Extra on Tuesday.

It’s the first child for the couple, who tied the knot in June 2012. Baldwin also has one daughter (Ireland, 17) with ex-wife Kim Basinger.

Jamie-Lynn Sigler

Just a few weeks after she announced her engagement to pro-baseball star Cutter Dykstra, Jamie-Lynn Sigler has more big new…. she’s pregnant!

The “Guys with Kids” actress, 31, confirmed to PEOPLE that she’s expecting her first child with Dykstra, 23. “She couldn’t be more excited!” said a source.

Sigler is best known for her role on “The Sopranos” (and her stint playing herself on “Entourage). Dykstra is an infielder for the Washington Nationals and the son of former Phillies star Lenny Dykstra.

Penelope Cruz

The rumors are true – Penelope Cruz is expecting again.

The actress is “tremendously happy and very excited” to be pregnant with her second child with husband Javier Bardem, a rep told Hola!

The baby will join big brother Leonardo, 2.

Cruz, 38, and Bardem, 43, were married in July 2010. Fun fact: they’re part of a short list of husband and wife Oscar winners.