Kaley Cuoco is clearly part of the family!
The Big Bang Theory star looked right at home while vacationing with her boyfriend, Karl Cook, and his family in Australia.
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"We didn't have any fun at all on this trip," Cuoco captioned a slideshow of pics from their getaway. "Thank you Cook family for another trip of a lifetime ... and thank you @mrtankcook for being you ❤️."
See more snaps from the trip below.
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ET caught up with Cuoco in April, who said that despite catching a little "baby fever" from her friends, she and Cook are currently staying busy with their many dogs.
See more in the video below.