Keith Urban Dishes on Reese Witherspoon’s 40th Birthday Party

“Extra” caught up with Keith Urban at “American Idol” and got the scoop on Reese Witherspoon’s star-studded 40th birthday party last weekend.

Keith revealed that his bandmates flew out from Nashville, and the group did a half-hour set at the bash, which was held at the Warwick in L.A.

Taylor Swift and Reese even joined Keith on stage to sing "Shake It Off"!

“It was a fun night. We did ‘Sweet Home Alabama’ because of Reese’s film. So she got up and sang that with us. It was a great night.”

Other famous guests included Keith’s wife Nicole Kidman, Kate Hudson, Chelsea Handler, and Jennifer Aniston.

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