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Alyson Hannigan and hubby Alexis Denisof are expecting!

The How I Met Your Mother star showed off her tiny baby bump while on a stroll with 2-year-old daughter Satyana in Santa Monica.

A source close to the 37-year-old actress tells Us:

    "Alyson is thrilled to be pregnant! She's been wearing baggy clothes to cover the baby bump."

As for how her pregnancy will affect her role on HIMYM, Alyson lucks out because her character, Lily, is also expecting on the show! Talk about perfect timing.

See pix of Hannigan's baby bump in our photo gallery below!