The royal was at the US Open when the big news was announced on Monday.
Eugenie was rubbing shoulders with New York entrepreneur Phil Winser and Orange is the New Black star Uzo Aduba in the Moet & Chandon suite and was reportedly thrilled when she heard.
The princess told Aduba she was beyond "excited" over the news of another royal baby and was overheard saying that she had "much to celebrate that night" an eyewitness tells E! online.
Yes, we'll toast to that.
While Eugenie and Phil were photographed together throughout the day looking pretty smitten with one another (seriously, check out these pics), we're sure it was just a case of friendly banter. Plus Eugenie was clearly just ecstatic about the royal baby news.
She's still doing the long distance thing with her boyfriend, of four years, Jack Brooksbank and they were last seen together at Tracey Emin's birthday party in London on 3 July.
Now that Kate Middleton and Prince Wills are expecting again we've got a feeling 24-year-old Eugenie will be making more visits back to Blighty to check in on the royal couple.
LOVE EUGENIE'S STYLE? Here's a look at how to dress like a real princess.
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