(Cover) - EN Showbiz - Lindsay Lohan partied up a storm to celebrate her 26th birthday over the weekend.

Although the Mean Girls star is officially a year older on July 2, she headed over to Hollywood nightclub Bootsy Bellows in the early hours of Sunday with a group of friends.

The troubled starlet was seen wearing a tight pink minidress and let loose with her pals.

"She sat at her table close to the DJ," an eyewitness told Us Weekly.

"[New group] Speakerz was there and performed several songs for Lindsay. She was loving them and looked happy and carefree as she danced all around with her friends."

Lindsay was later presented with a cake and Sprinkles Cupcakes and the whole club sang Happy Birthday to her.

"There was a ton of alcohol at Lindsay's table," the source added. "However she didn't appear to be drinking."

Lindsay has been keeping a lower profile after getting into a car accident on June 15 on the way to her film her new Lifetime movie Liz & Dick where she portrays her idol, Elizabeth Taylor. (C) Cover Media