PHOTO GALLERY: Lo Bosworth’s Birthday Bash

Happy birthday, Lauren Bosworth!

The Hills fave turned 23 on Tuesday, and celebrated the big day at West Hollywood watering hole Mi-6.

Also in attendance to help Lo ring in the occasion: Bosworth’s former Hills-mate, Lauren Conrad.

No Audrina, Kristin or Stephanie? Hmm…

Check out the pics and revel in the glory of it all!