It's baby bump Hudson!

After several weeks M.I.A., Kate Hudson emerged out of hiding on Monday morning, arriving at London's Heathrow airport with beau Matthew Bellamy -- and showing off her baby bump for the very first time.

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At first revealed at Us Weekly, Hudson, 31, is now about 16 weeks pregnant with the Muse frontman's child.

It will be Hudson's second little one; she has a 7-year-old son, Ryder, with rocker ex-husband Chris Robinson.

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Hudson's famous mom Goldie Hawn arrived in London a few days earlier to present at the British 2011 Comedy Awards -- and gushed to about her newest grand-baby-to-be.

"I'm excited! It's exciting," Hawn, 65, told Us Saturday of her daughter's pregnancy. "We're just all very happy... happy for them both. What's more to say?"

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Hudson and British musician Bellamy, 32, have been dating for nine months. The pregnancy "was not planned, but they are excited and embracing it," an insider revealed to Us.

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