I didn't mention it before because I couldn't prove it, but there were some photos where she was wearing something that looked like she might be concealing a baby bump. It would also explain why she's gone quiet on Twitter for a bit and re-emerged again lately - that was kind of the pattern when she had Ryder.
Congrats to her!
ETA: I just cross-checked her husband's Twitter page. His description now says "Ryder and River's dad." They are, in fact, the proud parents of two now!

