Reese Witherspoon observed her 40th birthday on Saturday with an exclusive performance by Taylor Swift as well as a duet with Keith Urban.

It was announced over the weekend that actress Reese Witherspoon would tour Australia later this year as part of a speaking tour. "Love you #TequillaFirst #PostingLater #SaturdayNight #ImSoExcitedToGetIntoBedIDontEvenKnowWhatToDoWithMyself #NotWashingMyFace #GoodNight ✨" and she also documented the night's fun on Snapchat.

Hard to believe Reese Witherspoon is hours away from reaching the big 4-0, as she doesn't look at day over 30.

Dressed in a long-sleeved glittery ensemble and heels, Witherspoon was all smiles as she sang into the microphone and pointed to the crowd to sing along with her. Taylor Swift even organized and put a private show for Reese and the other lucky guests as reported by ET Online.

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You can tell that she'd the greatest time observing her birthday.

But things clearly kicked it up a notch when her mother arrived, sharing this awesome video on Instagram.

Hudson also shared some of the pictures and videos from the birthday event on social media, as stated in the same report.

"Don't you think being a movie star you should be going home with a hot guy instead of me?" Witherspoon also got up on stage when the country singer performed "Sweet Home Alabama", a nod to the actress hit 2002 romantic comedy.