Watch Reese Witherspoon and Keith Urban perform 'Sweet Home Alabama' at her 40th birthday party

Reese Witherspoon Sings "Sweet Home Alabama" at 40th B-Day

Reese Witherspoon treated guests at her star-studded 40th birthday party in Los Angeles Saturday night (March 19) to a performance of Lynyrd Skynyrd's iconic song "Sweet Home Alabama."

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Witherspoon, who starred in the 2002 romantic comedy Sweet Home Alabama, was joined by Keith Urban on guitar for the entertaining performance, which was caught on video by Vanity Fair and fashion writer Derek Blasberg.

Another celebrity guests at the bash included Taylor Swift, who sang her hit song "Shake It Off," E!reports. The pop star was seen posing with actress Laura Dern and author Cheryl Strayed, who wrote the memoir Wild, in a photo on Instagram.

Check out more party photos below.

Um.. @taylorswift @lauradern #happybirthdayreese

A photo posted by Cheryl Strayed (@cherylstrayed) on

Just let me know when I have to stop wearing crop tops.

A photo posted by Erin Foster (@erinfoster) on

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