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"We better catch up on some sleep!"

There must be something in the Hollywood water.

We reported last week that Taye Diggs and wife Idina Menzel are expecting -- and now "Buffy the Vampire Slayer"'s Sarah Michelle Gellar and husband Freddie Prinze Jr., as well as "Guiding Light"'s Marcy Rylan and boyfriend Don Money, are also expecting tots! It will be the first child for both couples.

Gellar and Prinze have been married for six years, and their new family member will arrive sometime in the fall. A source close to the pair confirmed to People magazine that they're both "excited" about the new addition. Well, duh!

Rylan has been with her model boyfriend Money for a while, and her rep confirms the pregnancy -- but not the due date. We're pretty sure they're thrilled as well ...

All the best to both couples!