Yesterday, Chicago's B96 Radio hosted it's annual Summerbash sponsored and powered by Pepsi. It starred performances by Jennifer Lopez, Pitbull, Austin Mahone, Jason Derulo, Iggy Azalea, Icona Pop, Little Mix, Hot Chelle Rae & G.R.L.'

Jennifer Lopez performed a great performance BUT when it GREAT there's always something that has to screw it up. Lopez decided to give Chicago an surprise by debuting 'Acting Like That' which features Iggy Azalea from her forthcoming album 'A.K.A.' out this Tuesday. Lopez brings Azalea out to debut and perform the song with her, until it gets to Azalea's part and her mic was not on. Talking about another mic malfunction?

Azalea's first mic malfunction happened a month ago on Dancing With The Stars, when her ear piece was screwing up in her ear.

Azalea later tweeted out about the malfunction at the Summerbash.

I was supposed to sing actin like that with JLo at summer bash today but some idiot handed me a microphone that wasn't even turned on ? ?

? IGGY AZALEA (@IGGYAZALEA) June 15, 2014

Watch the performance below and see how Iggy Iggs plays it off.