Audrina Patridge Becomes an Aunt!

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Casey Patridge, sister of The Hills star Audrina Patridge, gave birth to a baby daughter, Sadie Raine, back on January 22. Hooray!

Sadie - weighing 7 pounds, 3 ounces - is the first child for Casey Patridge and her fiance, Aaron Hershman. Congratulations to them!

Audrina Patridge confirmed the birth to Us Weekly.

"She is the most beautiful baby I have ever seen," said the roommate and BFF of Lauren Conrad. "I'm so happy to be an Auntie!"

Audrina and Casey Patridge

Audrina and Casey Patridge are some seriously cute siblings!

The Hills fans have probably heard the gossip Audrina and Lauren Conrad are at odds and that was the reason Audrina was out of town a lot.

Patridge specified, though, that the reason she was spending so much time in Orange County (where she's from) was to help pregnant Casey.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.