The So You Think You Can Dance presenter looked radiant in a pretty black and gold frock at the Audi Celebrates Emmys Week bash on Thursday (17 September).
Cat is nominated at this year's Emmys in the 'Best Host' category, going up against the likes of Heidi Klum from Project Runway and Glee's Jane Lynch, who hosts Hollywood Game Night.
She's a huge star in the US, after switching the UK for LA. As well as hosting the massively popular So You Think You Can Dance, she was the first Brit to ever host Regis & Kelly in the US, and was the first regular entertainment reporter on Jay Leno's Tonight Show.
Comedian husband Patrick joined her at last night's celebration. He splits his time between LA, where Cat lives, and the UK, where he works.
The couple announced their pregnancy news earlier this month, with Cat tweeting: "Exciting news.... Paddy and I are so happy to be expecting our first child in the Spring..... Lucky us."
They married in September 2012.
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