Party time: Taylor Swift was among one of the many famous faces that helped Reese Witherspoon celebrate her upcoming 40th birthday and she even took to the stage on Sunday night

Completing her look with black boots and a chic black handbag, the blonde beauty wore her short bob in a shaggy style.

Taylor was seen holding on to her friends arm as they made their way into the venue for a night of merriment.

Black to basics: So it’s no surprise the singer did her best to stand out amongst the crowd of celebrities as she showed off her lithe physique in a sheer black top and a leather mini skirt

Heading in: The Shake It Off hitmaker was hard to miss as she made her way to the Warwick Nightclub in Hollywood in the racy ensemble

Keeping it cute: Completing her look with black boots and a chic black handbag, the blonde beauty wore her short bob in a shaggy styleShe sang her signature song Sweet Home Alabama, from her 2002 film of the same name, with rocker and American Idol judge Keith on guitar.

The moment was captured by author and Vanity Fair writer Derek Blasberg, who posted it on Instagram.

He captioned it: ‘You can take the girl out the South, but you can’t take Sweet Home Alabama out the girl! HAPPY BIRTHDAY @reesewitherspoon (cc @keithurban)’.

The Cruel Intentions star will likely have a quieter party on Tuesday – her actual birth date – with her three children, Ava, 16, and Deacon, 12, with ex-husband Ryan Phillippe and three-year-old son Tennessee with her CAA agent husband Jim Toth.

Big night out: Taylor was seen holding on to her friends arm as they made their way into the venue for a night of merriment