Alyssa Milano is pregnant -- Milo’s getting a sibling!

Alyssa Milano is pregnant with baby No. 2, the actress announced Friday.

“Ahem! Click here for some BIG, HUGE, HAPPY news,� the “Mistresses� star wrote on Twitter, including a link to her official blog.

“We are so happy to share with you that Milo is going to be a big brother!,� read the prize at the other end of the link.

PHOTOS: The Hollywood baby boom

Daddy-to-be is David Bugliari, the CAA agent the “Charmed� and “Who’s the Boss?� actress married in 2009. Son Milo arrived in April 2011.

“Alyssa is so excited to be pregnant again!� a source told Us Weekly. “She just recently started showing.�

Seems Milo wasn’t destined to be an only child for long. “I want to have another child, just because I want Milo to have a sibling and have someone to grow with,� Milano told People in September. “My brother and I are so close, and I can’t imagine not giving my son that kind of relationship.�

At the time, she told the mag she’d found a good balance between motherhood and working and was feeling content.

“It’s hard not to be happy when I feel fulfilled,� she said.

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