Kim K's Look-Alike Backs That Thing Up AT VEGAS GAY CLUB

8/1/2011 4:00 PM PDT

Kim K's Old Navy Look-Alike Sings

Melissa Molinaro -- that chick in the Old Navy commercial that looks just like Kim Kardashian -- brought her bootyful talents to the stage lit up table at Las Vegas gay club Piranha this weekend.

Last month, Kardashian filed a lawsuit against Old Navy because she claims they hired Melissa to dupe the public into thinking Kim is affiliated with the clothing giant.

No word if Melissa sang Kim's song "Jam (Turn It Up)."